Submitted to: Plant Disease Management Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/22/2007
Publication Date: 4/1/2007
Citation: Chen, W., Mcphee, K.E., Muehlbauer, F.J. 2007. Field evaluation of fungicides for control of Ascochyta blight of chickpea, 2006.. Plant Disease Management Reports.
Interpretive Summary: Spraying fungicides is an important practice in controlling Ascochyta blight. However, the efficiacy of the fungicides, particularly of new products, were unnown in the Pacific Northwest. This field study evaluated five fungicides for their efficacy against Ascochyta blight of chickpea at two locations in Pullman, WA and Genesee, ID. Results showed that the effective fungicides are Proline, Headline, Bravo and Quadris opti. The effective fungicides did significantly reduce disease severity and increase yield on susceptible cultivar Spanish White. Some effect of these fungicides on resistant cultivar Dwelley is also noticable.
Technical Abstract: To evaluate foliar fungicides against Ascochyta bligt of chickpea caused by Ascochyta rabiei, field plots were set up at Pullman, WA and Genesee, ID. The fungicides evaluated were Bravo, Headline, Proline, Quadris opti, and Tanos. Disease pressure was higher at the Pullman location than the Genesee location. Analyses of variance showed significant differences in disease severity among fungicide treatments and between cultivars and significant interactions between fungicide and cultivar treatments at both locations. No significant differences in 100 seed weights and plot yields among main plot treatments were detected. At Genesee, all fungicide treatments reduced disease severity. At the Pullman location, all fungicide treatments reduced disease severity of ‘Spanish White’, with the most significant effects resulting from applications of Proline and Quadris opti. For ‘Dwelley’, treatments with Proline and Quadris opti consistently reduced disease severity on all three rating dates. In summary, all fungicide treatments tested provided are effective to certain degree against Ascochyta blight.