Plant Disease (2012) 96, p. 1073 (Delgado et al.)

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J.A. Delgado, R.S. Goswami, R.M. Harveson, C.A. Urrea, D. Beran and S.G. Markell (2012)
First report of Ascochyta blight caused by QoI-resistant isolates of Ascochyta rabiei in chickpea fields of Nebraska and South Dakota
Plant Disease 96 (7), 1073-1073
Abstract: During 2010, chickpea (Cicer arietinum) plants grown in Nebraska and South Dakota, U.S.A. were treated with pyraclostrobin to control Ascochyta rabiei but symptoms of circular brown lesions with concentric rings of dark brown pycnidia were observed on the treated plants. The fungus Ascochyta rabiei was isolated from the diseased plants. The identification was based on morphological characteristics and ITS sequence analysis. Also, these isolates were determined to be QoI-resistant in vitro by PDA amended with a discriminatory dose of 1 μg/ml of azoxystrobin.
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Full text of article
Database assignments for author(s): Samuel G. Markell

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Ascochyta rabiei Chickpea (Cicer arietinum) U.S.A. (mid N)