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Pre-harvest chemical applications for control of tuber infection byAlternaria solani

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Abstract

Pre-harvest chemical applications significantly reduced populations of viableAlternaria solani spores on the soil surface in the laboratory and field and the infection of potato tubers in the field. Only formaldehyde consistently reduced spore germination and tuber infection in the laboratory and the field but Difolatan 4F, Difolatan 4F + DMSO (dimethyl-sulfoxide), Manzate D, Manzate D + DMSO and sodium hypochlorite often reduced fungus populations significantly. More work is necessary before pre-harvest chemical applications can be recommended for control of early blight tuber decay due to the variable performance of many chemicals and the relatively high cost and corrosiveness of formaldehyde, the most effective chemical in the study.

Resumen

Aplicaciones químicas antes de la cosecha redujeron significativamente las poblaciones de esporas viables de Alternaria solani en la superficie del suelo en laboratorio y campo y también la infección de los tubérculos de papa en el campo. Sólo el formaldehido redujo la germinación de las esporas consistentemente y la infección de los tubérculos en laboratorio y campo. Difolatan 4F, Difolatan 4F + DMSO (dimethylsulfoxide), Manzate D, Manzate D + DMSO e hypoclorito de sodio, redujeron a menudo la población del hongo significativamente. Más trabajo es necesario antes de que la aplicación quimica pre-cosecha pueda ser recomendada para controlar la pudrición de los tubérculos por tizón tardio debido a la performance variable de varios quimicos y el costo relativamente alto y corrosividad del formaldehido, el quimico más efectivo en este estudio.

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Published with the approval of the Director, Colorado State University Experiment Station as Scientific Journal Series Paper Number 2721.

Partially supported by the Area 3 Potato Administrative Committee, Greeley, Colorado 80631.

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Lahman, L.K., Harrison, M.D. & Knutson, K.W. Pre-harvest chemical applications for control of tuber infection byAlternaria solani . American Potato Journal 59, 523–532 (1982). https://doi.org/10.1007/BF02852601

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  • DOI: https://doi.org/10.1007/BF02852601

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