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Description of Albugo Fungi- an Obligate Parasite
Description of Albugo fungi- an obligate parasite Dr. Pallavi J.N.L. College Khagaul Classification Kingdom: Fungi Phylum: Oomycota Class: Oomycetes Order: Peronosporales Family: Albuginaceae Genus: Albugo Species: Albugo candida Distribution of Albugo • This genus is represented by 25 species distributed all around the world • They are all plant parasite. • Albugo candida also known as Cystopus candidus is the most important pathogen of Brassicaceae/Crucifereae members, causing white rust. Other families that are prone to attack of this fungi are Asteraceae, Convolvulaceae and Chenopodiaceae. Signs and Symptoms • This pathogen attack all the above ground parts. Infection takes place through stomata. • The disease results in the formation of shiny white irregular patches on leaves or stems. In the later stages, these patches turn powdery. The flowers and fruits gets deformed. Hypertrophy (increase in size of the cells and organs) is also a symptom of the disease. Deformed leaves of cabbage infected with Albugo candida Reproduction in Albugo • The fungus reproduces both by asexual and sexual methods • Asexual Reproduction: • The asexual reproduction takes place by conidia, condiosporangia or zoosporangia. They are produced on the sporangiophores. Under suitable conditions the mycelium grows and branches rapidly. • After attaining a certain age of maturity, it produces a dense mat like growth just beneath the epidermis of the host and some of the hyphae start behaving as sporangiophores or conidiophores. These sporangiophores contain dense cytoplasm and about a dozen nuclei. Later, the apical portion of sporangiophore gets swollen and a constriction appears below the swollen end and results in the formation of first sporangium. A second sporangium is similarly formed from the tip just beneath the previous one. -
Albugo Candida on Isatis Emarginata
Journal of Plant Pathology (2018) 100:587 https://doi.org/10.1007/s42161-018-0091-1 DISEASE NOTE First confirmed report of white blister rust disease caused by Albugo candida on Isatis emarginata Mohammad Reza Mirzaee1 & Sebastian Ploch2 & Lisa Nigrelli2,3 & Sepide Sajedi4 & Marco Thines2,3 Published online: 7 June 2018 # Società Italiana di Patologia Vegetale (S.I.Pa.V.) 2018 Isatis emarginata Kar. & Kir. (syn. I. violascens Bunge)isan (10–)11.8–16.6(−21) μm (mean 14.2 μm) (n =50).Primary annual therophyte belonging to the Brassicaceae. It is distrib- sporangia and secondary sporangia were morphologically uted in Iran, Afghanistan, Pakistan, and East Anatolia. In similar except that the former had slightly thicker walls than April 2011, white blister rust disease symptoms including the latter. No oospores were found in infected tissue. The whitish sori, usually on the lower leaf surfaces of I. identity of the pathogen was further analysed by sequencing emarginata, were noticed in Mighan, Nehbandan, South the mitochondrial locus cox2 and the nuclear ribosomal inter- Khorasan province of Iran. Recent phylogenetic analyses have nal transcribed spacers (ITS) (Mirzaee et al. 2013). The con- revealed that besides Albugo candida, several specialised spe- sensus sequences of ITS (MF580755) and cox2 (MF580756) cies are present in the genus Albugo (Ploch et al. 2010). Dried were identical with A. candida sequences in GenBank (100% specimens of I. emarginata (voucher FR0046090) with white identity to DQ418500 and DQ418511, for ITS and cox2, re- blister symptoms were examined in terms of the morphology spectively). Therefore, the species causing white blister rust of the pathogen and molecular phylogeny. -
Exotic Pests of Concern for Ornamental Plants Introduction
Exotic Pests of Concern for Ornamental Plants Introduction • Exotic Arthropod Pests • Exotic Diseases – Red palm weevil – Red ring disease of – Daylily leaf miner palms – Japanese maple scale – Boxwood blight – Passionvine mealybug – Impatiens downy mildew – Red palm mites – Chrysanthemum white – Tremex wood wasp rust – Sirex wood wasp – Texas Phoenix palm decline – Brown marmorated stink bug – Bleeding canker of horse chestnut – European pepper moth Exotic Arthropods Has been found and Red Palm Weevil eradicated • Rhynchophorus ferrugineus – Distribution • Native to Asia, spread to Middle East, Portugal, Spain • First detected in US in California in 2010 – Hosts • Palms, American Agave, sugarcane • Attracted to wounded plants Image Credit: John Kabashima, University of California Bugwood.org, #5444382 Has been found and Red Palm Weevil eradicated Image Credit: Top Left: Mike Lewis, Center for Invasive Species Research, Bugwood.org, # 5430201 Bottom Left: Amy Roda, USDA-APHIS Right: Christina Hoddle, University of California, Bugwood.org, # 5430200 Has been found and Red Palm Weevil eradicated Image Credit; Amy Roda, USDA-APHIS Has been found and Red Palm Weevil eradicated Image Credit; Amy Roda, USDA-APHIS). Has been found and Red Palm Weevil eradicated • Management – Monitoring – Cultural • Sanitation • Sealants • Groundcover Monitoring bucket. – Chemical* Image Credit; Amy Roda, USDA-APHIS). • Carbaryl, chlorpyrifos, diazinon, endosulfan, fipronil, imidacloprid, malathion, acephate, azinphos-methyl, methidathion, demethoate, trichlorfon *Be sure to check with your local county agent to find out which chemicals are certified for use in your state, on what crop it is allowed to be used, if it is allowed to be used post-harvest or pre-harvest, and if it should be applied by a licensed applicator. -
Diseases of Leafy Crucifer Vegetables (Collards, Kale, Mustard, Turnips)
Oklahoma Cooperative Extension Service EPP-7666 Diseases of Leafy Crucifer Vegetables (collards, kale, mustard, turnips) John Damicone Extension Plant Pathologist Oklahoma Cooperative Extension Fact Sheets are also available on our website at: Vegetable crops in the crucifer family, grown for their ed- http://osufact.okstate.edu ible leaves include collards, kale, mustard, turnips, and turnip x mustard hybrids. These cool-season crops are well adapted cabbage, cauliflower, broccoli, radish, etc.) are avoided for spring and fall production in Oklahoma. While most of the for at least two years. Rotations with corn, grain sorghum, production is for processing, both processing and fresh markets or another summer grass crops particularly are beneficial demand high-quality produce free of blemishes. Diseases are for reducing levels of root-knot nematodes. important factors limiting the production of leafy greens. Dis- Site selection and preparation - Selecting well-drained soils eases mainly cause damage by reducing crop quality. Severe and forming raised beds helps avoid damping-off, root disease development can reduce quality to the point where rot, and wilt diseases promoted by water-logged soils. the crop is unmarketable. Preparing a good seed bed promotes rapid seedbed Agents (pathogens) that cause the most common dis- germination and seedling growth. Acid soils should be eases of leafy greens are molds (fungi) and bacteria, but avoided or corrected with lime. Maintaining records on diseases caused by viruses and nematodes also can be the disease history of fields helps avoid disease problems a problem. This Fact Sheet is intended to aid growers in and the timely use of control measures. -
Current Status of Research on Rust Fungi (Pucciniales) in India
Asian Journal of Mycology 4(1): 40–80 (2021) ISSN 2651-1339 www.asianjournalofmycology.org Article Doi 10.5943/ajom/4/1/5 Current status of research on Rust fungi (Pucciniales) in India Gautam AK1, Avasthi S2, Verma RK3, Devadatha B 4, Sushma5, Ranadive KR 6, Bhadauria R2, Prasher IB7 and Kashyap PL8 1School of Agriculture, Abhilashi University, Mandi, Himachal Pradesh, India 2School of Studies in Botany, Jiwaji University, Gwalior, Madhya Pradesh, India 3Department of Plant Pathology, Punjab Agricultural University, Ludhiana, Punjab, India 4 Fungal Biotechnology Lab, Department of Biotechnology, School of Life Sciences, Pondicherry University, Kalapet, Pondicherry, India 5Department of Biosciences, Chandigarh University Gharuan, Punjab, India 6Department of Botany, P.D.E.A.’s Annasaheb Magar Mahavidyalaya, Mahadevnagar, Hadapsar, Pune, Maharashtra, India 7Department of Botany, Mycology and Plant Pathology Laboratory, Panjab University Chandigarh, India 8ICAR-Indian Institute of Wheat and Barley Research (IIWBR), Karnal, Haryana, India Gautam AK, Avasthi S, Verma RK, Devadatha B, Sushma, Ranadive KR, Bhadauria R, Prasher IB, Kashyap PL 2021 – Current status of research on Rust fungi (Pucciniales) in India. Asian Journal of Mycology 4(1), 40–80, Doi 10.5943/ajom/4/1/5 Abstract Rust fungi show unique systematic characteristics among all fungal groups. A single species of rust fungi may produce up to five morphologically and cytologically distinct spore-producing structures thereby attracting the interest of mycologist for centuries. In India, the research on rust fungi started with the arrival of foreign visiting scientists or emigrant experts, mainly from Britain who collected fungi and sent specimens to European laboratories for identification. Later on, a number of mycologists from India and abroad studied Indian rust fungi and contributed a lot to knowledge of the rusts to the Indian Mycobiota. -
Albugo: Contents: 1
Albugo: Contents: 1. Habit and Habitat of Albugo 2. Symptoms of Albugo 3. Vegetative Structure of Albugo 4. Reproduction in Albugo 5. Biological Specialization or Physiological Specialization in Albugo 6. Control Measures of Albugo 1. Habit and Habitat of Albugo: Albugo (derived from a Latin word means white), the only genus of family Albuginaceae is represented by more than 25 species. It is an obligate parasite distributed all over the world. In India about 18 species of Albugo have been reported which attacks mostly crucifers like turnip, mustard, radish, cabbage, cauliflower etc. However, it has also been reported on some members of family Asteraceae (Composite, Convolvulaceae and Chenopodiaceae). 2. Symptoms of Albugo: The disease caused by Albugo is commonly known as white rust because it appears in the form of shiny, white, smooth irregular patches (pustules) or blisters on the leaves, stems and other aerial parts of the plant. The pustules are initially formed on the lower surface of the leaf but in several cases they may be present on both the surfaces (Fig. 1 A). With this several other effects are also produced. Increase in the size of the cells (hypertrophy) and organs takes place. It results in the formation of large galls on the various parts of the host (Fig. 1 B-D). Severe infection causes proliferation of the lateral buds, discoloration of flowers, malformation of floral parts and sterile gynoecium. 3. Vegetative Structure of Albugo: Thallus is eucarpic and mycelial. Hyphae are intercellular, coenocytic, aseptate and profusely branched(Fig. 2 B). Cell wall is composed of fungal cellulose. -
Field Manual of Diseases on Garden and Greenhouse Flowers Field Manual of Diseases on Garden and Greenhouse Flowers
R. Kenneth Horst Field Manual of Diseases on Garden and Greenhouse Flowers Field Manual of Diseases on Garden and Greenhouse Flowers R. Kenneth Horst Field Manual of Diseases on Garden and Greenhouse Flowers R. Kenneth Horst Plant Pathology and Plant Microbe Biology Cornell University Ithaca, NY , USA ISBN 978-94-007-6048-6 ISBN 978-94-007-6049-3 (eBook) DOI 10.1007/978-94-007-6049-3 Springer Dordrecht Heidelberg New York London Library of Congress Control Number: 2013935122 © Springer Science+Business Media Dordrecht 2013 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, speci fi cally the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on micro fi lms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied speci fi cally for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. -
Dimorphism of Sporangia in Albuginaceae (Chromista, Peronosporomycetes)
ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Sydowia Jahr/Year: 2006 Band/Volume: 58 Autor(en)/Author(s): Constantinescu Ovidiu, Thines Marco Artikel/Article: Dimorphism of sporangia in Albuginaceae (Chromista, Peronosporomycetes). 178-190 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.at Dimorphism of sporangia in Albuginaceae (Chromista, Peronosporomycetes) O. Constantinescu1 & M. Thines2 1 Botany Section, Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36 Uppsala, Sweden 2 Institute of Botany, University of Hohenheim, Garbenstrasse 30, D-70599 Stuttgart, Germany Constantinescu O. & Thines M. (2006) Dimorphism of sporangia in Albugi- naceae (Chromista, Peronosporomycetes). - Sydowia 58 (2): 178 - 190. By using light- and scanning electron microscopy, the dimorphism of sporangia in Albuginaceae is demonstrated in 220 specimens of Albugo, Pustula and Wilsoniana, parasitic on plants belonging to 13 families. The presence of two kinds of sporangia is due to the sporangiogenesis and considered to be present in all representatives of the Albuginaceae. Primary and secondary sporangia are the term recommended to be used for these dissemination organs. Key words: Albugo, morphology, sporangiogenesis, Pustula, Wilsoniana. The Albuginaceae, a group of plant parasitic, fungus-like organisms traditionally restricted to the genus Albugo (Pers.) Roussel (Cystopus Lev.), but to which Pustula Thines and Wilsoniana Thines were recently added (Thines & Spring 2005), differs from other Peronosporomycetes mainly by the sub epidermal location of the unbranched sporangiophores, and basipetal sporangiogenesis resulting in chains of sporangia. A feature only occasionally described is the presence of two kinds of sporangia. Tulasne (1854) was apparently the first to report this character in Wilsoniana portulacae (DC. -
European Journal of Plant Pathology
European Journal of Plant Pathology Molecular identification and pathogenicity assessment of a rust fungus infecting common ragweed (Ambrosia artemisiifolia) in its native North American range --Manuscript Draft-- Manuscript Number: EJPP-D-15-00300R1 Full Title: Molecular identification and pathogenicity assessment of a rust fungus infecting common ragweed (Ambrosia artemisiifolia) in its native North American range Article Type: Original Article Keywords: allergenic weed; classical biological control; fungal species concept; Pucciniaceae; Pucciniomycetes; invasive alien species Corresponding Author: Levente Kiss, PhD, DSc Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences Budapest, HUNGARY Corresponding Author Secondary Information: Corresponding Author's Institution: Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences Corresponding Author's Secondary Institution: First Author: Edit Kassai-Jáger, PhD First Author Secondary Information: Order of Authors: Edit Kassai-Jáger, PhD Marion K. Seier, PhD Harry C. Evans, PhD Levente Kiss, PhD, DSc Order of Authors Secondary Information: Funding Information: EU COST Action Marion K. Seier (FA1203, SMARTER) Dr Levente Kiss Abstract: A rust fungus collected from common ragweed (Ambrosia artemisiifolia) in Texas, USA, was identified as belonging to the Puccinia xanthii morphospecies based on its nrDNA ITS sequence. Pathogenicity studies carried out with this rust accession under quarantine conditions in the UK showed that the fungus was highly virulent on A. artemisiifolia plants from Australia. Recently, P. xanthii has been proposed as a potential classical biological control agent (CBCA) for common ragweed in its invasive range, focusing on Europe, despite previous doubts about its biocontrol potential. The results of the pathogenicity tests reported here support the suitability of this pathogen as a CBCA for common ragweed. -
Application of PGPR and Antagonist Fungi-Based Biofungicide for White
266 AGRIVITA Journal of Agricultural Science. 2017. 39(3): 266-278 Application of PGPR and Antagonist Fungi-based Biofungicide for White Rust Disease Control and Its Economyc Analysis in Chrysanthemum Production Hanudin*), Kurniawan Budiarto and Budi Marwoto Indonesian Ornamental Crops Research Institute (IOCRI) Jl. Raya Pacet-Ciherang, PO Box. 8 SDL, Cianjur, West Java, Indonesia Corresponding author E-mail: [email protected] Received: November 18, 2016 /Accepted: May 31, 2017 ABSTRACT flowers (Market News Service, 2012), second only to Plant growth promoting rhizobacteria (PGPR) roses. Netherlands, Italy, Columbia, Spain, Germany and USA are the main producers which supply more application in combination with other antagonist than 60 % of the world trade for chrysanthemums. microbes as biopesticide have been considered In Indonesia, chrysanthemum has replaced roses in many crops. Our research was conducted to as the most marketed cut flowers since 2006. The evaluate the efficacy of these useful combinations with the carrying agent for growth promotion, thus demand for flowers has increased significantly in line with the increase of production in the country lowering white rust incidence in chrysanthemum in the last decade from 108 million stems in 2009 production. The experiment was carried out at to 387 million stems in 2013. The increase was to three cooperative farmer sites located in Cipanas, the increment of productivity from 9.92 % to 42.64 Cianjur, West Java, Indonesia from January to % respectively, thereby gave higher contribution to December 2016. The production process was arranged in a paired treatment; a combination of the export values of the total exported floriculture products from 8.0 % to 23.3 % in 2012 (Indonesian PGPR and antagonist fungi (without supplemental Ministry of Agriculture, 2014). -
Review of Horseradish Breeding for Improved Root Quality and Yield in Illinois, USA
agronomy Review Review of Horseradish Breeding for Improved Root Quality and Yield in Illinois, USA Stuart Alan Walters School of Agricultural Sciences, Southern Illinois University, Carbondale, IL 62901, USA; [email protected]; Tel.: +1-618-453-3446 Abstract: Horseradish cultivars are highly heterozygous clones and are maintained through asexual propagation, using root cuttings. For many years, horseradish was believed to be sterile and therefore impossible to improve by traditional sexual crosses. Prior to the 20th century, the only way to improve horseradish was to select and plant root cuttings from the most desirable plants. Moreover, the development of new improved horseradish cultivars has also been somewhat limited by the lack of viable seed resulting from low fertility of horseradish flowers. However, in Illinois, USA, a horseradish breeding program was initiated in the 1950s to develop additional cultivars to widen the genetic base of the few cultivars being grown at the time. In more recent years, the proven cross breeding technique has been primarily used to obtain new genotypes of horseradish, since it is more efficient in producing new improved cultivars, compared to the polycross method that had been previously used for decades to obtain new genetic combinations. Since horseradish is a minor specialty crop with very little available information regarding breeding procedures, this review was developed to provide a better understanding of pollination barriers and methods for fertility improvement, traditional breeding procedures and cultivar development, and traditional breeding achievements and limitations. The development of new horseradish cultivars is essential for the sustained success of the Illinois, USA industry since it provides growers with a continuous supply of new selections that have increased vigor, outstanding root quality, and high yields. -
EPPO Reporting Service
ORGANISATION EUROPEENNE EUROPEAN AND ET MEDITERRANEENNE MEDITERRANEAN POUR LA PROTECTION DES PLANTES PLANT PROTECTION ORGANIZATION EPPO Reporting Service NO. 8 PARIS, 2017-08 General 2017/145 New data on quarantine pests and pests of the EPPO Alert List 2017/146 Quarantine list of the Eurasian Economic Union (EAEU) 2017/147 EPPO communication kits: new templates for pest-specific posters and leaflets Pests 2017/148 Rhynchophorus ferrugineus does not occur in Australia 2017/149 Platynota stultana (Lepidoptera: Tortricidae): added again to the EPPO Alert List Diseases 2017/150 First report of Puccinia hemerocallidis in Portugal 2017/151 First report of Pantoea stewartii in Malaysia 2017/152 Citrus leprosis disease is associated with several viruses 2017/153 Brevipalpus phoenicis, vector of citrus leprosis, is a species complex Invasive plants 2017/154 The suppressive potential of some grass species on the growth and development of Ambrosia artemisiifolia 2017/155 Bidens subalternans in the EPPO region: addition to the EPPO Alert List 2017/156 Abiotic constraints and biotic resistance control the establishment success of Humulus scandens 21 Bld Richard Lenoir Tel: 33 1 45 20 77 94 E-mail: [email protected] 75011 Paris Fax: 33 1 70 76 65 47 Web: www.eppo.int EPPO Reporting Service 2017 no. 8 - General 2017/145 New data on quarantine pests and pests of the EPPO Alert List By searching through the literature, the EPPO Secretariat has extracted the following new data concerning quarantine pests and pests included (or formerly included) on the EPPO Alert List, and indicated in bold the situation of the pest concerned using the terms of ISPM no.