Plant Disease (2021) 105 (10 - 2709)

Ji Yeon Oh, Jeong-In Heo and Dong-Hyeon Lee (2021)
First report of anthracnose on pecan (Carya illinoinensis) caused by Colletotrichum siamense in Korea
Plant Disease 105 (10 - 2709)
Abstract: During 2020, pecan fruits, Carya illinoinensis, grown in South Korea were observed with symptoms of dark, depressed, and irregularly shaped lesions. As the disease progressed, the lesions expanded and merged over time, leading to abscission of the fruit, which resulted in severe yield loss of pecan fruit. Of 3 pecan varieties grown in 2 orchards (Caddo, Giles, and Peruque), Peruque appeared to be most susceptible to the disease. Estimated losses were approximately 30 and 70% for the 2 affected orchards. The fungus Colletotrichum siamense was isolated from the diseased plants. The identification was based on morphological characteristics and DNA sequence analysis. Pathogenicity of the isolates was demonstrated by inoculation and re-isolation.
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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 siamense	Pecan/hickory (Carya)	Korea-South