Identification and Characterization of Pestalotiopsis spp. Causing Scab Disease of Guava, Psidium guajava, in Hawaii

Plant Disease
L M KeithFrancis T Zee

Abstract

Guava is one of the most widely grown plants in the tropics; however, it is affected by many fruit rot diseases. Fruit diseases decrease the marketability of fresh fruit and fruit for processing. A survey of scab disease was conducted at the USDA/ARS Tropical Plant Genetic Resource Management Unit in Hilo, HI, where more than 50 accessions of guava are grown. Symptoms observed were gray/light brown lesions surrounded by dark brown borders on leaves and brown, raised, corky, necrotic lesions on the exocarp of fruit which progressed as the fruits matured. Seventeen isolates from infected fruit, six isolates from lesions on leaves, and nine isolates from additional crops surrounding the guava trees were collected. The main fungi consistently isolated from symptomatic leaves and fruit were Pestalotiopsis spp. Morphology, colony characteristics, and pathogenicity of the isolates were examined and potential sources of host resistance were identified for germplasm characterization studies. Molecular methods were used to identify four Pestalotiopsis taxa (P. clavispora, P. microspora, P. sp. GJ-1, and P. disseminata) on guava in Hawaii. To our knowledge, this is the first report of traditional and molecular methods of identification an...Continue Reading

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Citations

Jan 18, 2012·Natural Product Reports·Xiao-Long YangDu-Qiang Luo
Apr 5, 2014·Microbiology and Immunology·Halkare Suryanarayana VasaviPunchapady-Devasya Rekha
Dec 15, 2015·Current Microbiology·Najmeh Ayoubi, Mohammad J Soleimani
Sep 9, 2011·PloS One·Chengqun LvBo Ding
Apr 24, 2018·International Journal of Microbiology·S K KimaruA Alakonya
Oct 21, 2015·Archives of Pharmacal Research·Jin XiePei-Ji Zhao
Aug 11, 2021·Plants·Jiraporn SangtaRatchadawan Cheewangkoon
Dec 11, 2014·Studies in Mycology·S S N MaharachchikumburaP W Crous

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