Journal of Fungi (2022) 8 (7 - 740)

Yang Chen, Dandan Fu, Wei Wang, Mark L. Gleason, Rong Zhang, Xiaofei Liang and Guangyu Sun (2022)
Diversity of Colletotrichum species causing apple bitter rot and Glomerella leaf spot in China
Journal of Fungi 8 (7 - 740)
Abstract: Bitter rot and Glomerella leaf spot (GLS) of apples, caused by Colletotrichum species, are major diseases of apples around the world. A total of 98 isolates were obtained from apple fruits with bitter rot, and 53 isolates were obtained from leaves with leaf spot in the primary apple production regions in China. These isolates were characterized morphologically, and five gene regions (ITS, ACT, GAPDH, CHS-1 and TUB2) were sequenced for each isolate. A phylogenetic analysis, combined with a comparison of the morphological, cultural and pathogenic characters, sorted bitter rot isolates into six species: C. alienum, C. fructicola, C. gloeosporioides sensu stricto, C. nymphaeae, C. siamense and one new species, C. orientalis Dandan Fu and G.Y. Sun. Among these, C. siamense was the predominant pathogen associated with bitter rot. Isolates from leaf spot were identified as two species, C. aenigma and C. fructicola. This is the first report of C. orientalis as an apple bitter rot pathogen worldwide, and the results provide important insights into the diversity of Colletotrichum species in China.
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Database assignments for author(s): Mark L. Gleason, Guangyu Sun

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	Apple (Malus)
	Colletotrichum fructicola	Apple (Malus)
	Colletotrichum alienum	Apple (Malus)
	Colletotrichum siamense	Apple (Malus)
	Colletotrichum nymphaeae	Apple (Malus)
	Colletotrichum aenigma	Apple (Malus)