Plant Disease (2019) 103, 1464-1473

Joey S. Mayorquin, Mohamed T. Nouri, Beth B. Peacock, Florent P. Trouillas, Greg W. Douhan, Craig Kallsen and Akif Eskalen (2019)
Identification, pathogenicity, and spore trapping of Colletotrichum karstii associated with twig and shoot dieback in California
Plant Disease 103 (7), 1464-1473
Abstract: Colletotrichum Corda, 1831 species are well-documented pathogens of citrus that are associated with leaf and fruit anthracnose diseases. However, their role in twig and shoot dieback diseases of citrus has recently become more prominent. Recent surveys of orchards in the Central Valley of California have revealed C. gloeosporioides and a previously undocumented species, C. karstii, to be associated with twig and shoot dieback. Pathogenicity tests using clementine (cv. 4B) indicated that both C. karstii and C. gloeosporioides are capable of producing lesions following inoculation of citrus stems. Pathogenicity tests also revealed C. karstii to be the most aggressive fungal species producing the longest lesions after 15 months. The majority of spores trapped during this study were trapped during or closely following a precipitation event with the majority of spores being trapped from January through May. These findings confirm C. karstii as a new pathogen of citrus in California.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Greg W. Douhan, Akif Eskalen

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Colletotrichum gloeosporioides	Citrus (genus)	U.S.A. (SW)
	Colletotrichum karstii	Citrus (genus)	U.S.A. (SW)