DOCSLIB.ORG

Transmission of Xylella Fastidiosa to Grapevine by the Meadow Spittlebug

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Transmission of Xylella Fastidiosa to Grapevine by the Meadow Spittlebug Ecology and Epidemiology Transmission of Xylella fastidiosa to Grapevine by the Meadow Spittlebug D. Cornara, A. Sicard, A. R. Zeilinger, F. Porcelli, A. H. Purcell, and R. P. P. Almeida First and fourth authors: DiSSPA, sez. Zoologia ed Entomologia, Universita` degli Studi di Bari Aldo Moro, via Amendola 165/A, 70126 Bari; and second, third, fifth, and sixth authors: ESPM, University of California-Berkeley, 130 Mulford Hall 3114, Berkeley, CA 94720. Accepted for publication 30 June 2016. ABSTRACT Cornara, D., Sicard, A., Zeilinger, A. R., Porcelli, F., Purcell, A. H., and by P. spumarius increased with plant access time, similarly to insect vectors Almeida, R. P. P. 2016. Transmission of Xylella fastidiosa to grapevine in another family (Hemiptera, Cicadellidae). Furthermore, a positive by the meadow spittlebug. Phytopathology 106:1285-1290. correlation between pathogen populations in P. spumarius and trans- mission to plants was observed. Bacterial populations in insects were one There is little information available on Xylella fastidiosa transmission to two orders of magnitude lower than those observed in leafhopper by spittlebugs (Hemiptera, Cercopoidea). This group of insect vectors vectors, and population size peaked within 3 days of plant access period. may be of epidemiological relevance in certain diseases, so it is important These results suggest that P. spumarius has either a limited number of sites to better understand the basic parameters of X. fastidiosa transmission in the foregut that may be colonized, or that fluid dynamics in the by spittlebugs. We used grapevines as a host plant and the aphrophorid mouthparts of these insects is different from that in leafhoppers. Altogether Philaenus spumarius as a vector to estimate the effect of plant access time our results indicate that X. fastidiosa transmission by spittlebugs is similar on X. fastidiosa transmission to plants; in addition, bacterial population to that by leafhoppers. In addition, the relationship between cell numbers in estimates in the heads of vectors were determined and correlated with plant vectors and plant infection may have under-appreciated consequences to infection status. Results show that transmission efficiency of X. fastidiosa pathogen spread. The bacterium Xylella fastidiosa is an economically important of plant pathogens. Machaerotids are tube-building insects that plant pathogen that is present throughout the Americas, Europe have not been shown to transmit X. fastidiosa but are vectors of (Italy and France), Asia (Taiwan), and the Middle-East (Almeida Ralstonia syzygii, a xylem-colonizer that causes Sumatra disease of and Nunney 2015). The lifestyle of X. fastidiosa requires the clove trees (Eden-Green et al. 1992). Insects in the other three colonization of insect and plant hosts; in addition, natural dispersal families have been shown to transmit X. fastidiosa. Severin (1950) is solely mediated by insect vectors (Chatterjee et al. 2008). demonstrated that three aphrophorids (Philaenus spumarius [syn. Therefore, knowledge about insect and plant colonization, as well Philaenus leucophthalmus], Aphrophora angulata,andAphrophora as plant-to-plant transmission can guide the development of control permutata)andoneclastopterid(Clastoptera brunnea) were vectors strategies for diseases caused by X. fastidiosa. Traditionally, of X. fastidiosa. Purcell (1980) and Saponari et al. (2014) also research has focused on how this pathogen colonizes host plants, confirmed that P.spumarius was a vector of this bacterium to plants. with some but more limited attention given to insect hosts. In In addition, Clastoptera achatina (Clastopteridae) and Lepyronia addition, some of the key parameters of X. fastidiosa vector quadrangularis (Aphrophoridae) were shown to transmit X. fastidiosa transmission have been determined. to pecans (Sanderlin and Melanson 2010). Severin (1950) referred to Insect vectors belong to three groups of xylem sap-feeding P. spumarius as P. leucophtalmus; he also stated that five varieties insects, the sharpshooter leafhoppers (Hemiptera: Cicadellidae of the meadow spittlebugs were tested (leucophtalmus, pallidus, Cicadellinae), spittlebugs (Hemiptera: Cercopoidea), and cicadas fabricii, marginellus,andimpressus). In 1961, the Commission (Hemiptera: Cicadoidaea). There are only two reports of cicadas as of Zoological Nomenclature decided that the valid specific name vectors (Krell et al. 2007; Paia˜o et al. 2002), and because of the for this taxon was spumarius and not leucophtalmus; the poly- limited information more research is required on the role of these morphism and variation of wing markings generated confusion in insects in X. fastidiosa spread. The first identified X. fastidiosa the nomenclature (Yurtsever 2000). vectors were sharpshooter leafhoppers (Hewitt and Houston 1946; Severin (1950), however, was the only study to provide informa- Hewitt et al. 1942). Frazier and Freitag (1946) demonstrated that tion on the characteristics of transmission other than vector identifi- several leafhopper species transmitted X. fastidiosa, information cation. In that study it was shown that P. spumarius transmission of which decades later led Frazier (1965) to propose that xylem sap X. fastidiosa lacked a detectable latent period (shortest period tested of feeding insects should be considered vectors of this pathogen until 2 h) and that the bacterium was persistently retained in adults (up to proven otherwise; this proposal still stands (Almeida and Nunney 76 days). The transmission of X. fastidiosa to plants by sharpshooter 2015). The superfamily Cercopoidea has five families, Aphrophor- leafhoppers has similar characteristics; it lacks a latent period (Purcell idae, Cercopidae, Clastopteridae, Epigydae, and Machaerotidae. and Finlay 1979) and is persistent in adults (Almeida and Purcell Epigyds have, to our knowledge, not been studied as insect vectors 2003b; Hill and Purcell 1995a). Additional work with leafhoppers has shown that X. fastidiosa is not transovarially (Freitag 1951) or transtadially transmitted (Almeida and Purcell 2003b; Purcell and Corresponding author: R. Almeida; E-mail address: [email protected] Finlay 1979). The lack of latent period, transovarial, and transtadial transmission, suggest that the retention site of X. fastidiosa is in the *The e-Xtra logo stands for “electronic extra” and indicates that one supplementary table is published online. foregut of leafhopper vectors, which was first shown using microscopy by Purcell et al. (1979). Recent work by Cornara et al. (2016) also http://dx.doi.org/10.1094/PHYTO-05-16-0202-R documented X. fastidiosa-like cells in the foregut of the aphrophorid © 2016 The American Phytopathological Society P. spumarius. The observed lack of X. fastidiosa genotype–vector Vol. 106, No. 11, 2016 1285 species specificity among leafhoppers has not been analyzed for needle inoculated (Almeida and Purcell 2003a). Every plant was spittlebugs, but these insects transmit X. fastidiosa strains belonging to inoculated at 5 and 20 cm from the base with a 5-µl drop of a 109 at least three different subspecies (Sanderlin and Melanson 2010; CFU/ml suspension (population assessed by dilution plating) in Saponari et al. 2014; Severin 1950), suggesting that this is also a sodium-citrate-phosphate (SCP) buffer with a number 1 entomo- conserved trait. Despite the lack of research on the Cercopoidea as logical pin. Plants were watered daily and fertilized once every vectors of X. fastidiosa, the limited information available suggests that month (Osmocote Plus 15-9-12). Source plants were tested for parameters of plant-to-plant transmission are similar to those described X. fastidiosa by culturing 1 month after inoculation, then pruned to for sharpshooter leafhoppers. 20 cm in height. One month after pruning, X. fastidiosa population Two important parameters affecting the spread of X. fastidiosa in the distal third of the plants was determined by culturing; plants diseases, however, are pathogen transmission efficiency (over time) with petiole samples with 3 to 6 × 106 CFU/ml (Hill and Purcell and rate (one time point), both of which vary based on host 1997) and 30 cm tall were used as source plants. Three-month-old plant–insect–pathogen combinations (Lopes et al. 2009; Purcell cuttings of V. vinifera Cabernet Sauvignon grown in 3 gallon- 1981). Transmission can also be affected by within plant feeding capacity pots in a mix of Supersoil, sand, and perlite (2:1:1), preferences by insect vectors (Daugherty et al. 2010) or vector watered daily, and fertilized monthly (Osmocote Plus 15-9-12), discrimination against disease symptomatic plant tissue (Zeilinger were used as recipient plants. We pruned the cuttings to 20 cm and Daugherty 2014). There are no data on spittlebug-X. fastidiosa height, also removing lateral shoots, 1 week prior to insect access. transmission efficiency (i.e., how the frequency of transmission Transmission efficiency. We tested how X. fastidiosa trans- events changes over time). In addition, the diagnostic and mission efficiency by P. spumarius on grapevines varied in relation quantification of X. fastidiosa cells in the foregut of insect vectors to durations of acquisition access period (AAP) and IAP. Five AAP has been challenging to perform until the more recent advent of and IAP treatments were used: 1.5; 4.5; 12; 24; and 48 h, each with molecular diagnostic tools for this purpose. Currently available data 30 independent replicates, keeping for each treatment a
Load more

Recommended publications
  • Xylella Fastidiosa HOST: GRAPEVINE
    Xylella fastidiosa HOST: GRAPEVINE What is Xylella fastidiosa and why is it so serious? ◆ A dangerous bacterium threatening hundreds of species of plants in the UK ◆ It is spreading across southern Europe from its origins in the Americas ◆ Can be transported by sap-feeding insects such as spittlebugs ◆ Causes plant death by blocking water transporting vessels (xylem) ◆ Currently no cure Vitis vinifera ◆ Deciduous climbing shrub ◆ Flaky bark ◆ Climbs by tendrils reaching 15–18m high ◆ Three- or five-lobed, coarsely toothed leaves, 7.5–15cm long and wide, with stalks half as long as the blade, hairy underneath and of variable colour ◆ Tiny greenish flowers ◆ Oval or globose fruit Healthy Diseased What is BRIGIT? A collaborative project aimed at reducing the risk of a Xylella introduction into the UK and mitigating the risks in the event of an outbreak. Please turn over to find out more. What to look 1 out for 2 ◆ Marginal leaf scorch 1 ◆ Leaf chlorosis 2 ◆ Premature loss of leaves 3 ◆ Matchstick petioles 3 ◆ Irregular cane maturation (green islands in stems) 4 ◆ Fruit drying and wilting 5 ◆ Stunting of new shoots 5 ◆ Death of plant in 1–5 years Where is the plant from? 3 ◆ Plants sourced from infected countries are at a much higher risk of carrying the disease-causing bacterium Do not panic! 4 How long There are other reasons for disease symptoms to appear. Consider California. of University Montpellier; watercolour, RHS Lindley Collections; “healthy”, RHS / Tim Sandall; “diseased”, J. Clark, California 3 J. Clark & A.H. Purcell, University of California 4 J. Clark, University of California 5 ENSA, Images © 1 M.
    [Show full text]
  • UNIVERSITY of CALIFORNIA SANTA BARBARA Animal Personality
    UNIVERSITY OF CALIFORNIA SANTA BARBARA Animal personality shapes the outcome of species interactions and thereby the structure of ecosystems A Dissertation submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy in Ecology, Evolution, and Marine Biology by James Leo Loving Lichtenstein Committee in charge: Professor Erika Eliason, Chair Professor Hillary Young Professor Adrian Stier September 2020 The dissertation of James Leo Loving Lichtenstein is approved. _____________________________________________ Adrian Stier _____________________________________________ Hillary Young _____________________________________________ Erika Eliason, Chair August 2020 Acknowledgements: Funding for this research was provided by the University of California Santa Barbara, the Pape and McKinley Foundations of the University of Pittsburgh, the National Science Foundation grant awards to J.N.P. (1352705 and 1455895), and a National Institutes of Health grant awarded to J.N.P (R01GM115509). I thank the Pymatuning Laboratory of Ecology of the University of Pittsburgh for patiently hosting these outlandish projects over the years. I particularly want to thank Dr. Cori Zawacki, Chris Davis, Jessica Barabas, Nick Mihailoff, Glenn Robinson, and Linda Fries for their help in getting these projects off the ground. I thank Jonathan Pruitt for his erstwhile help and support in many aspects of this work. Finally, I thank Erika Eliason, Hillary Young, and Adrian Stier for being on my committee. Copyright notice: Chapter 2, “The multidimensional behavioral hypervolumes of two interacting species predict their space use and survival” and Chapter 3, “Habitat structure changes the relationships between predator behavior, prey behavior, and prey survival rates” are reproductions of the following two articles respectively: https://doi.org/10.1016/j.anbehav.2017.08.010, https://doi.org/10.1007/s00442-019-04344-w.
    [Show full text]
  • Xylella Fastidiosa – What Do We Know and Are We Ready
    Xylella fastidiosa: What do we know and are we ready? Suzanne McLoughlin, Vinehealth Australia. Xylella is a major threat due to its multiple hosts Suzanne McLoughlin, Vinehealth Australia’s (more than 350 plant species, many of which Technical Manager, analyses the grape and wine do not show symptoms), its multiple vectors community’s preparedness and knowledge about and its continued global spread. The pathogen Xylella fastidiosa, which is known to the industry causes clogging of plant xylem vessels, resulting as Pierce’s disease. This article first appeared in Australian and New Zealand Grapegrower and in water stress-like symptoms to distal parts of Winemaker Magazine, June 2017. the grapevine, with vine death in 1-2 years post infection (Figure 44). The bacterium is primarily Introduction transmitted in the gut of sapsucking insects and Xylella fastidiosa is a gram-negative, rod-shaped the disease cannot occur without a vector. bacterium known to cause Pierce’s disease in viticulture. Xylella fastidiosa was the subject of an While Xylella fastidiosa is known as Pierce’s international symposium held in Brisbane in May disease in grapevines, it is known as many other 2017, organised by the Department of Agriculture names in other host plants. It is inherently difficult and Water Resources (DAWR). A broad range of to control and there are no known treatments to international experts shared their knowledge and cure diseased plants. experience on Xylella with Australian federal and Xylella fastidiosa has been reported on various state government biosecurity personnel, as well host crops, either symptomatic or asymptomatic, as a small number of invited industry participants.
    [Show full text]
  • So You Want to Grow Grapes in Tennessee
    Agricultural Extension Service The University of Tennessee PB 1689 So You Want to Grow Grapes in Tennessee 1 conditions. American grapes are So You Want to Grow versatile. They may be used for fresh consumption (table grapes) or processed into wine, juice, jellies or Grapes in Tennessee some baked products. Seedless David W. Lockwood, Professor grapes are used mostly for fresh Plant Sciences and Landscape Systems consumption, with very little demand for them in wines. Yields of seedless varieties do not match ennessee has a long history of grape production. Most recently, those of seeded varieties. They are T passage of the Farm Winery Act in 1978 stimuated an upsurge of also more susceptible to certain interest in grape production. If you are considering growing grapes, the diseases than the seeded American following information may be useful to you. varieties. French-American hybrids are crosses between American bunch 1. Have you ever grown winery, the time you spend visiting and V. vinifera grapes. Their grapes before? others will be a good investment. primary use is for wine. uccessful grape production Vitis vinifera varieties are used S requires a substantial commit- 3. What to grow for wine. Winter injury and disease ment of time and money. It is a American problems seriously curtail their marriage of science and art, with a - seeded growth in Tennessee. good bit of labor thrown in. While - seedless Muscadines are used for fresh our knowledge of how to grow a French-American hybrid consumption, wine, juice and jelly. crop of grapes continues to expand, Vitis vinifera Vines and fruits are not very we always need to remember that muscadine susceptible to most insects and some crucial factors over which we Of the five main types of grapes diseases.
    [Show full text]
  • Citrus Blight and Other Diseases of Recalcitrant Etiology
    P1: FRK August 1, 2000 18:44 Annual Reviews AR107-09 Annu. Rev. Phytopathol. 2000. 38:181–205 Copyright c 2000 by Annual Reviews. All rights reserved CITRUS BLIGHT AND OTHER DISEASES OF RECALCITRANT ETIOLOGY KS Derrick and LW Timmer University of Florida, Institute of Food and Agricultural Sciences, Citrus Research and Education Center, Lake Alfred, Florida 33850-2299; e-mail: [email protected]fl.edu, [email protected]fl.edu Key Words citrus psorosis, citrus variegated chlorosis, lettuce big vein, peach tree short life, replant diseases ■ Abstract Several economically important diseases of unknown or recently de- termined cause are reviewed. Citrus blight (CB), first described over 100 years ago, was shown in 1984 to be transmitted by root-graft inoculations; the cause remains unknown and is controversial. Based on graft transmission, it is considered to be an infectious agent by some; others suggest that the cause of CB is abiotic. Citrus varie- gated chlorosis, although probably long present in Argentina, where it was considered to be a variant of CB, was identified as a specific disease and shown to be caused by a strain of Xylella fastidiosa after if reached epidemic levels in Brazil in 1987. Citrus psorosis, described in 1933 as the first virus disease of citrus, is perhaps one of the last to be characterized. In 1988, it was shown to be caused by a very unusual virus. The cause of lettuce big vein appears to be a viruslike agent that is transmitted by a soilborne fungus. Double-stranded RNAs were associated with the disease, suggesting it may be caused by an unidentified RNA virus.
    [Show full text]
  • Electrophysiological and Behavioural Response of Philaenus Spumarius To
    www.nature.com/scientificreports OPEN Electrophysiological and behavioural response of Philaenus spumarius to essential oils and aromatic plants Sonia Ganassi1,5, Pasquale Cascone2,5, Carmela Di Domenico1, Marco Pistillo3, Giorgio Formisano2, Massimo Giorgini2, Pasqualina Grazioso4, Giacinto S. Germinara3, Antonio De Cristofaro 1* & Emilio Guerrieri 2 The meadow spittlebug, Philaenus spumarius, is a highly polyphagous widespread species, playing a major role in the transmission of the bacterium Xylella fastidiosa subspecies pauca, the agent of the “Olive Quick Decline Syndrome”. Essential oils (EOs) are an important source of bio-active volatile compounds that could interfere with basic metabolic, biochemical, physiological, and behavioural functions of insects. Here, we report the electrophysiological and behavioural responses of adult P. spumarius towards some EOs and related plants. Electroantennographic tests demonstrated that the peripheral olfactory system of P. spumarius females and males perceives volatile organic compounds present in the EOs of Pelargonium graveolens, Cymbopogon nardus and Lavandula ofcinalis in a dose- dependent manner. In behavioral bioassays, evaluating the adult responses towards EOs and related plants, both at close (Y-tube) and long range (wind tunnel), males and females responded diferently to the same odorant. Using EOs, a clear attraction was noted only for males towards lavender EO. Conversely, plants elicited responses that varied upon the plant species, testing device and adult sex. Both lavender and geranium repelled females at any distance range. On the contrary, males were attracted by geranium and repelled by citronella. Finally, at close distance, lavender and citronella were repellent for females and males, respectively. Our results contribute to the development of innovative tools and approaches, alternative to the use of synthetic pesticides, for the sustainable control of P.
    [Show full text]
  • Dual RNA Sequencing of Vitis Vinifera During Lasiodiplodia Theobromae Infection Unveils Host–Pathogen Interactions
    International Journal of Molecular Sciences Article Dual RNA Sequencing of Vitis vinifera during Lasiodiplodia theobromae Infection Unveils Host–Pathogen Interactions Micael F. M. Gonçalves 1 , Rui B. Nunes 1, Laurentijn Tilleman 2 , Yves Van de Peer 3,4,5 , Dieter Deforce 2, Filip Van Nieuwerburgh 2, Ana C. Esteves 6 and Artur Alves 1,* 1 Department of Biology, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; [email protected] (M.F.M.G.); [email protected] (R.B.N.) 2 Laboratory of Pharmaceutical Biotechnology, Campus Heymans, Ottergemsesteenweg 460, B-9000 Ghent, Belgium; [email protected] (L.T.); [email protected] (D.D.); [email protected] (F.V.N.) 3 Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium; [email protected] 4 Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium 5 Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria 0028, South Africa 6 Faculty of Dental Medicine, Center for Interdisciplinary Research in Health (CIIS), Universidade Católica Portuguesa, Estrada da Circunvalação, 3504-505 Viseu, Portugal; [email protected] * Correspondence: [email protected]; Tel.: +351-234-370-766 Received: 28 October 2019; Accepted: 29 November 2019; Published: 3 December 2019 Abstract: Lasiodiplodia theobromae is one of the most aggressive agents of the grapevine trunk disease Botryosphaeria dieback. Through a dual RNA-sequencing approach, this study aimed to give a broader perspective on the infection strategy deployed by L. theobromae, while understanding grapevine response. Approximately 0.05% and 90% of the reads were mapped to the genomes of L.
    [Show full text]
  • Bees and Wasps of the East Sussex South Downs
    A SURVEY OF THE BEES AND WASPS OF FIFTEEN CHALK GRASSLAND AND CHALK HEATH SITES WITHIN THE EAST SUSSEX SOUTH DOWNS Steven Falk, 2011 A SURVEY OF THE BEES AND WASPS OF FIFTEEN CHALK GRASSLAND AND CHALK HEATH SITES WITHIN THE EAST SUSSEX SOUTH DOWNS Steven Falk, 2011 Abstract For six years between 2003 and 2008, over 100 site visits were made to fifteen chalk grassland and chalk heath sites within the South Downs of Vice-county 14 (East Sussex). This produced a list of 227 bee and wasp species and revealed the comparative frequency of different species, the comparative richness of different sites and provided a basic insight into how many of the species interact with the South Downs at a site and landscape level. The study revealed that, in addition to the character of the semi-natural grasslands present, the bee and wasp fauna is also influenced by the more intensively-managed agricultural landscapes of the Downs, with many species taking advantage of blossoming hedge shrubs, flowery fallow fields, flowery arable field margins, flowering crops such as Rape, plus plants such as buttercups, thistles and dandelions within relatively improved pasture. Some very rare species were encountered, notably the bee Halictus eurygnathus Blüthgen which had not been seen in Britain since 1946. This was eventually recorded at seven sites and was associated with an abundance of Greater Knapweed. The very rare bees Anthophora retusa (Linnaeus) and Andrena niveata Friese were also observed foraging on several dates during their flight periods, providing a better insight into their ecology and conservation requirements.
    [Show full text]
  • Comparative Analysis of the Mitochondrial Genomes Of
    Comparative Analysis of the Mitochondrial Genomes of Callitettixini Spittlebugs (Hemiptera: Cercopidae) Confirms the Overall High Evolutionary Speed of the AT- Rich Region but Reveals the Presence of Short Conservative Elements at the Tribal Level Jie Liu1,2, Cuiping Bu1,3, Benjamin Wipfler1, Aiping Liang1* 1 Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Chaoyang District, Beijing, P. R. China, 2 Graduate University of the Chinese Academy of Sciences, Shijingshan District, Beijing, P. R. China, 3 Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, Huaiyin Normal University, Huaian, Jiangsu Province, P. R. China Abstract The present study compares the mitochondrial genomes of five species of the spittlebug tribe Callitettixini (Hemiptera: Cercopoidea: Cercopidae) from eastern Asia. All genomes of the five species sequenced are circular double-stranded DNA molecules and range from 15,222 to 15,637 bp in length. They contain 22 tRNA genes, 13 protein coding genes (PCGs) and 2 rRNA genes and share the putative ancestral gene arrangement of insects. The PCGs show an extreme bias of nucleotide and amino acid composition. Significant differences of the substitution rates among the different genes as well as the different codon position of each PCG are revealed by the comparative evolutionary analyses. The substitution speeds of the first and second codon position of different PCGs are negatively correlated with their GC content. Among the five species, the AT-rich region features great differences in length and pattern and generally shows a 2–5 times higher substitution rate than the fastest PCG in the mitochondrial genome, atp8.
    [Show full text]
  • Pierce's Disease Research Symposium Proceedings
    Pierce’s Disease Control Program Symposium Proceedings 2004 Pierce’s Disease Research Symposium December 7 – 10, 2004 Coronado Island Marriott Resort Coronado, California California Department of Food & Agriculture Proceedings of the 2004 Pierce’s Disease Research Symposium December 7 – 10, 2004 Coronado Island Marriott Resort Coronado, California Organized by: California Department of Food and Agriculture Proceedings Compiled by: M. Athar Tariq, Stacie Oswalt, Peggy Blincoe, Amadou Ba, Terrance Lorick, and Tom Esser Cover Design: Peggy Blincoe Printer: Copeland Printing, Sacramento, CA Funds for Printing Provided by: CDFA Pierce’s Disease and Glassy-winged Sharpshooter Board To order additional copies of this publication, please contact: Pierce’s Disease Control Program California Department of Food and Agriculture 2014 Capitol Avenue, Suite 109 Telephone: (916) 322-2804 Fax: (916) 322-3924 http://www.cdfa.ca.gov/phpps/pdcp E-mail: [email protected] NOTE: The progress reports in this publication have not been subject to independent scientific review. The California Department of Food and Agriculture makes no warranty, expressed or implied, and assumes no legal liability for the information in this publication. The publication of the Proceedings by CDFA does not constitute a recommendation or endorsement of products mentioned. TABLE OF CONTENTS Section 1: Crop Biology and Disease Epidemiology Xylem Chemistry Mediation of Resistance to Pierce’s Disease Peter C. Andersen.......................................................................................................................................................................
    [Show full text]
  • The Muscadine Grape (Vitis Rotundifolia Michx)1 Peter C
    HS763 The Muscadine Grape (Vitis rotundifolia Michx)1 Peter C. Andersen, Ali Sarkhosh, Dustin Huff, and Jacque Breman2 Introduction from improved selections, and in fact, one that has been found in the Scuppernong River of North Carolina has The muscadine grape is native to the southeastern United been named ‘Scuppernong’. There are over 100 improved States and was the first native grape species to be cultivated cultivars of muscadine grapes that vary in size from 1/4 to in North America (Figure 1). The natural range of musca- 1 ½ inches in diameter and 4 to 15 grams in weight. Skin dine grapes extends from Delaware to central Florida and color ranges from light bronze to pink to purple to black. occurs in all states along the Gulf Coast to east Texas. It also Flesh is clear and translucent for all muscadine grape extends northward along the Mississippi River to Missouri. berries. Muscadine grapes will perform well throughout Florida, although performance is poor in calcareous soils or in soils with very poor drainage. Most scientists divide the Vitis ge- nus into two subgenera: Euvitis (the European, Vitis vinifera L. grapes and the American bunch grapes, Vitis labrusca L.) and the Muscadania grapes (muscadine grapes). There are three species within the Muscadania subgenera (Vitis munsoniana, Vitis popenoei and Vitis rotundifolia). Euvitis and Muscadania have somatic chromosome numbers of 38 and 40, respectively. Vines do best in deep, fertile soils, and they can often be found in adjacent riverbeds. Wild muscadine grapes are functionally dioecious due to incomplete stamen formation in female vines and incom- plete pistil formation in male vines.
    [Show full text]
  • 46601932.Pdf
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by OAR@UM BULLETIN OF THE ENTOMOLOGICAL SOCIETY OF MALTA (2012) Vol. 5 : 57-72 A preliminary account of the Auchenorrhyncha of the Maltese Islands (Hemiptera) Vera D’URSO1 & David MIFSUD2 ABSTRACT. A total of 46 species of Auchenorrhyncha are reported from the Maltese Islands. They belong to the following families: Cixiidae (3 species), Delphacidae (7 species), Meenoplidae (1 species), Dictyopharidae (1 species), Tettigometridae (2 species), Issidae (2 species), Cicadidae (1 species), Aphrophoridae (2 species) and Cicadellidae (27 species). Since the Auchenorrhyncha fauna of Malta was never studied as such, 40 species reported in this work represent new records for this country and of these, Tamaricella complicata, an eastern Mediterranean species, is confirmed for the European territory. One species, Balclutha brevis is an established alien associated with the invasive Fontain Grass, Pennisetum setaceum. From a biogeographical perspective, the most interesting species are represented by Falcidius ebejeri which is endemic to Malta and Tachycixius remanei, a sub-endemic species so far known only from Italy and Malta. Three species recorded from Malta in the Fauna Europaea database were not found during the present study. KEY WORDS. Malta, Mediterranean, Planthoppers, Leafhoppers, new records. INTRODUCTION The Auchenorrhyncha is represented by a large group of plant sap feeding insects commonly referred to as leafhoppers, planthoppers, cicadas, etc. They occur in all terrestrial ecosystems where plants are present. Some species can transmit plant pathogens (viruses, bacteria and phytoplasmas) and this is often a problem if the host-plant happens to be a cultivated plant.
    [Show full text]