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POSTERS: Chemical control

Efficacy of seed treatment fungicides for the management of seed-borne Ascochyta blight disease of chickpea under high disease pressure
Frankie Crutcher - Montana State University. Amber Ferda- Montana State University, Cecilia Peluola- Montana State University

Ascochyta Blight (AB) of chickpea caused by Ascochyta rabiei is one of the most damaging disease of chickpea worldwide. The recent development of resistance to promising fungicides used in managing AB intensified grower concerns and threaten optimum production. This field study evaluated the efficacy of nine modes of action from six fungicide classes - fludioxonil, sedaxane, thiabendazole, penflufen, prothioconazole, fluxapyroxad, pyraclostrobin, and mefentrifluconazole formulations at recommended rates for the control of seed-borne A. rabiei. The study used naturally infested chickpea seeds produced in Montana. The trial received additional foliar fungicide sprays against AB due to high disease pressure. Data collected at 2, 4, 6 and 20 weeks after planting were analyzed using SAS VS 9.4. All nine seed treatment fungicides performed better than the untreated control in terms of vigor, plant number and yield with the exception of AB disease (P = 0.4118). Ascochyta lesions were positively correlated with vigor (r = 0.57), and yield (r = 0.65) but negative for plant number (r = -0.0026). This first-year study provided information on the importance of seed treatment fungicides in the management of AB disease. The second-year study is in progress.