DOCSLIB.ORG

Avocado December 2017 PEST MANAGEMENT GUIDELINES for AGRICULTURE

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Avocado December 2017 PEST MANAGEMENT GUIDELINES for AGRICULTURE Avocado December 2017 PEST MANAGEMENT GUIDELINES FOR AGRICULTURE Contents (Dates in parenthesis indicate when each topic was updated) Avocado Year-round IPM Program (Revision 2016) ............................................................................................................................... v General Information (Section reviewed 09/16) ..........................................................................................................................................1 Manipulating Cultural Practices and Growing Conditions (09/16) .....................................................................................................1 Timings for Key Cultural and .....................................................................................................................................................................2 Monitoring Practices (09/16) ......................................................................................................................................................................2 When to Monitor Pests, Damage, and .......................................................................................................................................................3 Natural Enemies (09/16) .............................................................................................................................................................................3 Monitoring Caterpillars and their Natural Enemies (09/16) .................................................................................................................4 Monitoring Persea and Sixspotted Mites (09/16) ....................................................................................................................................6 Monitoring Diseases and Disease-Promoting Conditions (09/16) ......................................................................................................8 Rootstock Tolerance to Disorders and Pathogens (09/16) ...................................................................................................................10 Relative Toxicities of Insecticides, Miticides, and Molluscicides Used in Avocados to Natural Enemies and Honey Bees (09/16) ..........................................................................................................................................................................................................11 Invertebrates: Pests of Primary Concern (Section reviewed 09/16) .......................................................................................................13 Amorbia (Western Avocado Leafroller) (10/16) ...................................................................................................................................13 Avocado Brown Mite (09/16) ...................................................................................................................................................................18 Avocado Thrips (09/16) ............................................................................................................................................................................20 Greenhouse Thrips (09/16) .......................................................................................................................................................................25 Omnivorous Looper (09/16) .....................................................................................................................................................................29 Persea Mite (09/16) ....................................................................................................................................................................................33 Polyphagous Shot Hole Borer (12/17) ....................................................................................................................................................38 Kuroshio Shot Hole Borer (12/17) ...........................................................................................................................................................38 Sixspotted Mite (09/16) .............................................................................................................................................................................40 Invertebrates: Young-Tree Pests (Section reviewed 09/16) .....................................................................................................................42 Branch and Twig Borer (09/16) ................................................................................................................................................................42 Brown Garden Snail (09/16) .....................................................................................................................................................................43 European Earwig (09/16) ..........................................................................................................................................................................45 False Chinch Bug (09/16) ..........................................................................................................................................................................46 Fuller Rose Beetle (09/16) .........................................................................................................................................................................47 Grasshoppers (09/16) ................................................................................................................................................................................49 June Beetles (09/16) ....................................................................................................................................................................................51 Invertebrates: Uncommon or Rarely Managed Pests (Section reviewed 09/16) ..................................................................................53 Ants (09/16) ................................................................................................................................................................................................53 Armored Scales (09/16) .............................................................................................................................................................................56 Avocado Lace Bug (09/16) ........................................................................................................................................................................59 Glassy-Winged Sharpshooter (09/16) .....................................................................................................................................................61 Longtailed Mealybug (09/16) ...................................................................................................................................................................63 Neohydratothrips (09/16) .........................................................................................................................................................................65 Orange Tortrix (09/16) ..............................................................................................................................................................................66 Soft Scales (09/16) ......................................................................................................................................................................................69 Whiteflies (09/16) .......................................................................................................................................................................................70 Diseases (Section reviewed 09/16) ..............................................................................................................................................................72 Anthracnose (09/16) ..................................................................................................................................................................................72 Armillaria Root Rot (Oak Root Fungus) (09/16) ...................................................................................................................................74 Avocado Black Streak (09/16) ..................................................................................................................................................................76 Bacterial Canker (09/16) ............................................................................................................................................................................77 Branch Canker and Dieback ......................................................................................................................................................................78 (formerly Dothiorella Canker) (09/16) ...................................................................................................................................................78 Fruit and Stem-end Rots ............................................................................................................................................................................80 Fusarium Dieback (09/16) .........................................................................................................................................................................81
Load more

Recommended publications
  • Cambridge University Press 978-1-107-11607-8 — a Natural History of Ladybird Beetles M. E. N. Majerus , Executive Editor H. E. Roy , P
    Cambridge University Press 978-1-107-11607-8 — A Natural History of Ladybird Beetles M. E. N. Majerus , Executive Editor H. E. Roy , P. M. J. Brown Index More Information Index 2-isopropyl-3-methoxy-pyrazine, 238 281, 283, 285, 287–9, 291–5, 297–8, 2-phenylethylamine, 237 301–3, 311, 314, 316, 319, 325, 327, 329, 335 abdomen, 17, 20, 22, 24, 28–9, 32, 38, 42, 110, Adalia 4-spilota,80 114, 125, 128, 172, 186, 189, 209–10, Adalia conglomerata, 255 218 adaline, 108, 237, 241 Acacia, 197, 199 adalinine, 237 acaricides, 316 adelgids, 29, 49, 62, 65, 86, 91, 176, 199, 308, Acaridae, 217 310, 322 Acarina, 205, 217 Adonia, 44, 71 Acer pseudoplatanus, 50, 68, 121 aggregations, 163, 165, 168, 170, 178, 184, Acraea, 228, 297, 302 221, 312, 324 Acraea encedana, 302 Aiolocaria, 78, 93, 133, 276 Acraea encedon, 297, 302 Aiolocaria hexaspilota,78 Acyrthosiphon nipponicum, 101 Aiolocaria mirabilis, 133, 276 Acyrthosiphon pisum, 75, 77, 90, 92, 97–101, albino, 273 116, 239 Alces alces,94 Adalia, 5–6, 10, 22, 34, 44, 64, 70, 78, 80, 86, Aleyrodidae, 91, 310 123, 125, 128, 130, 132, 140, 143, 147, alfalfa, 119, 308, 316, 319, 325 159–60, 166–7, 171, 180–1, 218, 222, alimentary canal, 29, 35, 221 234, 237, 239, 241, 255, 259–60, 262, alkaloids, x, 99–100, 195–7, 202, 236–9, 241–2, 269, 279, 281, 284, 286, 298, 311, 325, 245–6 327, 335 Allantonematidae, 220 Adalia 10-punctata, 22, 70, 80, 86, 98–100, anal cremaster, 38, 40 104, 108, 116, 132, 146–7, 149, Anatis, 4, 17, 23, 41, 44, 66, 76, 89, 102, 131, 154, 156, 160, 174, 181–3, 188, 148, 165, 186, 191, 193,
    [Show full text]
  • Tachinid (Diptera: Tachinidae) Parasitoid Diversity and Temporal Abundance at a Single Site in the Northeastern United States Author(S): Diego J
    Tachinid (Diptera: Tachinidae) Parasitoid Diversity and Temporal Abundance at a Single Site in the Northeastern United States Author(s): Diego J. Inclan and John O. Stireman, III Source: Annals of the Entomological Society of America, 104(2):287-296. Published By: Entomological Society of America https://doi.org/10.1603/AN10047 URL: http://www.bioone.org/doi/full/10.1603/AN10047 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. CONSERVATION BIOLOGY AND BIODIVERSITY Tachinid (Diptera: Tachinidae) Parasitoid Diversity and Temporal Abundance at a Single Site in the Northeastern United States 1 DIEGO J. INCLAN AND JOHN O. STIREMAN, III Department of Biological Sciences, 3640 Colonel Glenn Highway, 235A, BH, Wright State University, Dayton, OH 45435 Ann. Entomol. Soc. Am. 104(2): 287Ð296 (2011); DOI: 10.1603/AN10047 ABSTRACT Although tachinids are one of the most diverse families of Diptera and represent the largest group of nonhymenopteran parasitoids, their local diversity and distribution patterns of most species in the family are poorly known.
    [Show full text]
  • Differences in the Sugar Composition of the Honeydew of Polyphagous
    NOTE Eur. J. Entomol. 108: 705–709, 2011 http://www.eje.cz/scripts/viewabstract.php?abstract=1671 ISSN 1210-5759 (print), 1802-8829 (online) Differences in the sugar composition of the honeydew of polyphagous brown soft scale Coccus hesperidum (Hemiptera: Sternorrhyncha: Coccoidea) feeding on various host plants KATARZYNA GOLAN 1 and AGNIESZKA NAJDA2 1Department of Entomology, University of Life Sciences in Lublin, LeszczyĔskiego 7, 20-069 Lublin, Poland; e-mail: [email protected] 2 Department of Vegetable and Medicinal Plants, University of Life Sciences in Lublin, LeszczyĔskiego 58, 20-068 Lublin, Poland Key words. Coccoidea, Coccus hesperidum, brown scale insects, honeydew, host plants, soft scale, sugar composition Abstract. Plant chemical composition is an important determinant of host plant-insect interactions. For many insects sugars are the main factors determining the acceptability of a plant. This study investigated changes in plant chemical composition and differences in sugar composition of different host plants induced by the feeding of Coccus hesperidum L. (Hemiptera: Sternorrhyncha: Coccoi- dea). Present in plant extracts and honeydew there were three monosaccharide sugars: glucose, fructose and arabinose, and one disaccharide – sucrose. Arabinose was only found in extracts of Ficus benjamina plants. The sugar content of the honeydew was greater than in the extracts of control plants and lower than that in the extracts of infested plants. The honeydew collected from C. hesperidum feeding on the three plant species differed significantly in sugar content. Extracts of coccid infested plants of the three species used in this study contained more sugar than the un-infested control plants. The results show that honeydew composition of scale insects differ and the differences reflect the chemical composition of the host plants.
    [Show full text]
  • Proceedings of the United States National Museum
    Proceedings of the United States National Museum SMITHSONIAN INSTITUTION • WASHINGTON, D.C. Volume 112 I960 Number 3431 LACE-BUG GENERA OF THE WORLD (HEMIPTERA: TINGIDAE) « By Carl J. Drake and Florence A. Ruhoff Introduction A treatise of the generic names of the family Tingidae from a global standpoint embodies problems similar to those frequently encountered in corresponding studies in other animal groups. The more im- portant criteria, including such basic desiderata as fixation of type species, synonyms, priority, and dates of technical publications implicate questions concomitant with recent trends toward the clarification and stabilization of zoological nomenclature. Zoogeography, predicated and authenticated on the generic level by the distribution of genera and species, is portrayed here by means of tables, charts, and maps of the tingifauna of the world. This visual pattern of distribution helps one to form a more vivid concept of the family and its hierarchic levels of subfamilies and genera. To a limited extent the data indicate distributional concentrations and probable centers of evolution and dispersal paths of genera. The phylogenetic relationship of genera is not discussed. The present treatise recognizes 216 genera (plus 79 synonyms, homonyms, and emendations) of the Tingidae of the world and gives 1 Research for this paper was supported In part by the National Science Foundation, grant No. 4095. 2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 the figure of 1,767 as the approximate number of species now recog- nized. These figures, collated with similar categories in Lethierry and Severin (1896), show that there has been an increase of many genera and hundreds of species of Tingidae during the past three- quarters of a century.
    [Show full text]
  • COLEOPTERA COCCINELLIDAE) INTRODUCTIONS and ESTABLISHMENTS in HAWAII: 1885 to 2015
    AN ANNOTATED CHECKLIST OF THE COCCINELLID (COLEOPTERA COCCINELLIDAE) INTRODUCTIONS AND ESTABLISHMENTS IN HAWAII: 1885 to 2015 JOHN R. LEEPER PO Box 13086 Las Cruces, NM USA, 88013 [email protected] [1] Abstract. Blackburn & Sharp (1885: 146 & 147) described the first coccinellids found in Hawaii. The first documented introduction and successful establishment was of Rodolia cardinalis from Australia in 1890 (Swezey, 1923b: 300). This paper documents 167 coccinellid species as having been introduced to the Hawaiian Islands with forty-six (46) species considered established based on unpublished Hawaii State Department of Agriculture records and literature published in Hawaii. The paper also provides nomenclatural and taxonomic changes that have occurred in the Hawaiian records through time. INTRODUCTION The Coccinellidae comprise a large family in the Coleoptera with about 490 genera and 4200 species (Sasaji, 1971). The majority of coccinellid species introduced into Hawaii are predacious on insects and/or mites. Exceptions to this are two mycophagous coccinellids, Calvia decimguttata (Linnaeus) and Psyllobora vigintimaculata (Say). Of these, only P. vigintimaculata (Say) appears to be established, see discussion associated with that species’ listing. The members of the phytophagous subfamily Epilachninae are pests themselves and, to date, are not known to be established in Hawaii. None of the Coccinellidae in Hawaii are thought to be either endemic or indigenous. All have been either accidentally or purposely introduced. Three species, Scymnus discendens (= Diomus debilis LeConte), Scymnus ocellatus (=Scymnobius galapagoensis (Waterhouse)) and Scymnus vividus (= Scymnus (Pullus) loewii Mulsant) were described by Sharp (Blackburn & Sharp, 1885: 146 & 147) from specimens collected in the islands. There are, however, no records of introduction for these species prior to Sharp’s descriptions.
    [Show full text]
  • COCCUS HESPERIDUM ) INFESTING Holly on VANCOUVER ISLAND
    THE SOFT SCALE (COCCUS HESPERIDUM ) INFESTING HOllY ON VANCOUVER ISLAND ( A Preliminary Report ) Tile :,,,ft ;.;cale ( Coccus hesperidum ( L. )) ha,; iJec\J111e \ery pre\-­ alent o n holly tre es in many part:; PI' the :,() uthe rn Yanc(lu\-e r I sland d istrict durin'g t h e past :-e,;r. It \\' <1" Ilrst noticed in the I'ic inity of Victor ia, B.C., during Febru ary, ] 93 :::: ; s pecimens \\'ere iUr\\'arcled t( I the D ivision of Entolllolog-y at Otta\\'a. and \\-e re s ub seCj ue ntly deter­ mined Ill- 1)1'. Tlarold :\ I(l rrisun o i \\'ashin~n\ln. D.C. ,-\ d clitional IlOlh' trees \\ -~ re e:'-: alllineci during the c (; urse of the 1 0:],'1 season \yhen w'e o bsen'ed the soft scale spreaciing Yer,\- r apid ly, .\ black fung-us ( pre)])­ ably Meliola camelliae Catt. \\'ith w hi c h thi:, scale is as,;ociated ) \\-as fO llnd to be present \\'here\'er the scale inie,;tatiun s occurrecl. Speci­ men s \\'Cre fo und a s far n o rth a s Duncan, The e:'tahli slllllent I Ii the ""it scale and t h e :' o ut,\-- lll uld fungus (I n hull), in I\riti,;h Columhia is it seri, IUS menace to the [>1'Ociuction and e:'-: pll rtatio n of ho lly f()r th e Ch r istmas season. Plant quarantine,; re­ o;t ricting the free 111(J\ elllent (I f the :'i cale-infested 11CJIh', foc u ,;,; ed t h e attention of t h e cOlll111e rc ial grll \\'er:, upo n th is pC'st ;lnd created an immediate n eecl fo r inf' lrlllati( ln u po n its life hahits and c() ntr,'].
    [Show full text]
  • Phylogenetic Relationships of Tachinid Flies in Subfamily Exoristinae Tachinidae: Diptera) Based on 28S Rdna and Elongation Factor-1A
    Systematic Entomology *2002) 27,409±435 Phylogenetic relationships of tachinid flies in subfamily Exoristinae Tachinidae: Diptera) based on 28S rDNA and elongation factor-1a JOHN O. STIREMAN III Department of Ecology and Evolutionary Biology,University of Arizona,Tucson,U.S.A. Abstract. The phylogenetic relationships within the largest subfamily of Tachi- nidae,Exoristinae,were explored using nucleotide sequences of two genes *EF-1 a and 28S rDNA). A total of fifty-five and forty-three taxa were represented in the analyses for each gene,respectively,representing forty-three genera. Neighbour joining,parsimony and maximum likelihood inference methods were employed to reconstruct phylogenetic relationships in separate analyses of each gene,and parsimony was used to analyse the combined dataset. Although certain taxa were highly mobile,phylogenetic reconstructions generally supported recent clas- sification schemes based on reproductive habits and genitalia. Generally,the monophyly of Tachinidae and Exoristinae was supported. Tribes Winthemiini, Exoristini and Blondeliini were repeatedly constructed as monophyletic groups, with the former two clades often occupying a basal position among Exoristinae. Goniini and Eryciini generally clustered together as a derived clade within Exoristinae; however,they were never reconstructed as two distinct clades. These results suggest that the possession of unembryonated eggs is plesiomorphic within the subfamily and that there may have been multiple transitions between micro- type and macrotype egg forms. Introduction 1987; Williams et al.,1990; Eggleton & Belshaw,1993), and the wide variety of mechanisms by which they attack Tachinidae is generally regarded as a relatively recent, them *O'Hara,1985). These oviposition strategies include actively radiating clade of parasitic flies *Crosskey,1976).
    [Show full text]
  • Avocado Sunblotch Viroid Testing by RT-PCR Deborah M
    Avocado sunblotch viroid testing by RT-PCR Deborah M. Mathews, Ph.D. Dept. of Plant Pathology, UC Riverside Avocado sunblotch viroid (ASBVd) is a small (247 nt) pathogen that causes discoloration and disfigurement of leaves and fruit. It is transmitted by grafting, pruning tools, pollen, seed, and root grafting. Our laboratory has developed RT-PCR for quickly and sensitively detecting ASBVd in both mature field trees and Typical symptoms of ASBVd on fruit and leaves small greenhouse/nursery trees. We have done testing for many commercial growers as well as 3 different researchers at UCR over the last 15 years. The California Department of Food and Agriculture (CDFA) has approved this method for use in the registration of trees for propagation of buds and nursery trees. Trees may recover from the symptomatic expression of the viroid and become “symptomless carrier” trees. These trees maintain high levels of the viroid in leaves, fruit and seed, but do not show the characteristic sunblotch symptoms shown above. The viroid is also readily transmitted by the pollen of these trees. One characteristic of these trees is they typically have low fruit set. If such trees were used for the production of nurse seeds, widespread transmission of the viroid could occur. Details of sunblotch testing Collection of tissue for ASBVd testing is as follows: All leaves should be hardened off and mature, but not excessively old or damaged by insects or wind. Ideally, each leaf should come from a separate branch to ensure a representative sample from around the canopy of the tree. Place leaves in plastic ziplock bags with NO WET TOWELS or other material.
    [Show full text]
  • Addenda to the Insect Fauna of Al-Baha Province, Kingdom of Saudi Arabia with Zoogeographical Notes Magdi S
    JOURNAL OF NATURAL HISTORY, 2016 VOL. 50, NOS. 19–20, 1209–1236 http://dx.doi.org/10.1080/00222933.2015.1103913 Addenda to the insect fauna of Al-Baha Province, Kingdom of Saudi Arabia with zoogeographical notes Magdi S. El-Hawagrya,c, Mostafa R. Sharafb, Hathal M. Al Dhaferb, Hassan H. Fadlb and Abdulrahman S. Aldawoodb aEntomology Department, Faculty of Science, Cairo University, Giza, Egypt; bPlant Protection Department, College of Food and Agriculture Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia; cSurvey and Classification of Agricultural and Medical Insects in Al-Baha Province, Al-Baha University, Al-Baha, Saudi Arabia ABSTRACT ARTICLE HISTORY The first list of insects (Arthropoda: Hexapoda) of Al-Baha Received 1 April 2015 Province, Kingdom of Saudi Arabia (KSA) was published in 2013 Accepted 30 September 2015 and contained a total of 582 species. In the present study, 142 Online 9 December 2015 species belonging to 51 families and representing seven orders KEYWORDS are added to the fauna of Al-Baha Province, bringing the total Palaearctic; Afrotropical; number of species now recorded from the province to 724. The Eremic; insect species; reported species are assigned to recognized regional zoogeogra- Arabian Peninsula; Tihama; phical regions. Seventeen of the species are recorded for the first Al-Sarah; Al-Sarawat time for KSA, namely: Platypleura arabica Myers [Cicadidae, Mountains Hemiptera]; Cletomorpha sp.; Gonocerus juniperi Herrich-Schäffer [Coreidae, Hemiptera]; Coranus lateritius (Stål); Rhynocoris bipus- tulatus (Fieber) [Reduviidae, Hemiptera]; Cantacader iranicus Lis; Dictyla poecilla Drake & Hill [Tingidae, Hemiptera]; Mantispa scab- ricollis McLachlan [Mantispidae, Neuroptera]; Cerocoma schreberi Fabricius [Meloidae, Coleoptera]; Platypus parallelus (Fabricius) [Curculionidae, Coleoptera]; Zodion cinereum (Fabricius) [Conopidae, Diptera]; Ulidia ?ruficeps Becker [Ulidiidae, Diptera]; Atherigona reversura Villeneuve [Muscidae, Diptera]; Aplomya metallica (Wiedemann); Cylindromyia sp.
    [Show full text]
  • Crop Profile for Apples in California General Production
    Crop Profile for Apples in California General Production Information ● Apple production in California represents 8.5% of the national production (1). ● California has over 38,500 bearing acres of apples (1). ● Yield per acre varies from 2 to 18 tons per acre throughout California’s growing regions, primarily due to irrigation and varietal differences (13). ● From 1995 to 1997, California apple growers average production was 920,000,000 pounds. In 1997, 962,000,000 pounds of apples were produced (1). ● The average value of apples produced in the state between 1995 and 1997 was $158,918,000. The value of apples produced in 1997 was $162,655,000 (1). ● The average cost to produce an acre of apples in California amounts to $4,523 per acre for irrigated orchards and $3,947 per acre for non-irrigated orchards (11, 12). Production Regions There are five major regions in which apples are grown in California. Historically, apple production was limited to the coastal mountains north and south of San Francisco Bay, in the Sierra foothills east of Sacramento, and in the Southern California mountains. Recently apple production has expanded into the Central Valley, with new plantings of Granny Smith, Fuji, Gala, and other varieties. Important coastal apple producing counties are Sonoma in the North Coast, and Santa Cruz and San Luis Obispo in the Central Coast region. However the major apple production areas are now in the San Joaquin Valley with Kern, Fresno, San Joaquin, and Madera counties being the leading producers (3). Southern California mountain regions still have a few orchards.
    [Show full text]
  • Coccidology. the Study of Scale Insects (Hemiptera: Sternorrhyncha: Coccoidea)
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Ciencia y Tecnología Agropecuaria (E-Journal) Revista Corpoica – Ciencia y Tecnología Agropecuaria (2008) 9(2), 55-61 RevIEW ARTICLE Coccidology. The study of scale insects (Hemiptera: Takumasa Kondo1, Penny J. Gullan2, Douglas J. Williams3 Sternorrhyncha: Coccoidea) Coccidología. El estudio de insectos ABSTRACT escama (Hemiptera: Sternorrhyncha: A brief introduction to the science of coccidology, and a synopsis of the history, Coccoidea) advances and challenges in this field of study are discussed. The changes in coccidology since the publication of the Systema Naturae by Carolus Linnaeus 250 years ago are RESUMEN Se presenta una breve introducción a la briefly reviewed. The economic importance, the phylogenetic relationships and the ciencia de la coccidología y se discute una application of DNA barcoding to scale insect identification are also considered in the sinopsis de la historia, avances y desafíos de discussion section. este campo de estudio. Se hace una breve revisión de los cambios de la coccidología Keywords: Scale, insects, coccidae, DNA, history. desde la publicación de Systema Naturae por Carolus Linnaeus hace 250 años. También se discuten la importancia económica, las INTRODUCTION Sternorrhyncha (Gullan & Martin, 2003). relaciones filogenéticas y la aplicación de These insects are usually less than 5 mm códigos de barras del ADN en la identificación occidology is the branch of in length. Their taxonomy is based mainly de insectos escama. C entomology that deals with the study of on the microscopic cuticular features of hemipterous insects of the superfamily Palabras clave: insectos, escama, coccidae, the adult female.
    [Show full text]
  • Detection of Avocado Sunblotch Viroid and Estimation of Infection Among Accessions in the National Germplasm Collection for Avocado
    Proc. Fla. State Hort. Soc. 109:235-237. 1996. DETECTION OF AVOCADO SUNBLOTCH VIROID AND ESTIMATION OF INFECTION AMONG ACCESSIONS IN THE NATIONAL GERMPLASM COLLECTION FOR AVOCADO Catherine M. Running and Raymond J. Schnell National Germplasm Repository U. S. Department of Agriculture Agricultural Research Service 13601 Old Cutler Road, Miami, FL 33158 David N. Kuhn Florida International University Dept. of Biological Sciences Miami, FL 33199 Additional index words. Persea Americana, RT-PCR, viroid, DNA, RNA, sequence variation, germplasm. ABSTRACT Reverse transcription-polymerase chain reaction (RTPCR) was used to determine the incidence of infection by avocado sunblotch viroid (ASBVd) in the germplasm collection at the National Germplasm Repository at Miami (NGR-Mia). Of the 429 avocado plants growing at the repository, 81 (18.9%) are infected with the viroid. The 429 plants represent 237 accessions. There are multiple plants of some accessions and for 42 accessions (17%) every plant is infected with the viroid. There was no apparent relationship between host race and the incidence of infection. Symptoms of sunblotch disease on avocado (Persea Americana Mill.) manifest as a general decline of tree vigor with sunken, yellow areas on the fruit that lessen its marketability. The disease was first described as infectious, rather than physiological, by Home and Parker (1931). The infectious agent has since been determined to be an RNA viroid known as Avocado Sunblotch Viroid (ASBVd) (Dale and Allen, 1979; Thomas and Mohammed, 1979). The viroid is transmitted by budding and grafting, including natural root grafting (Home etal, 1941; Whitsell, 1952), seed (Wallace and Drake, 1962), and pollen (Desjardins et al., 1979).
    [Show full text]