The evaluation of six fungicides for reducing Alternaria cassiae on cowpea seed
2002
Berg, N. van den | Aveling, T.A.S. | Venter, S.L.
Alternaria cassiae (Juriar and Khan) was found to be a destructive seed-borne, foliar pathogen of cowpea (Vigna unguiculata (L.) Walp) in Southern Africa. Six fungicides at three concentrations were evaluated for their efficacy in reducing the pathogen in culture and on seed. The fungicides included benomyl, bitertanol, captab (captan), mancozeb, propiconazole and triforine. An untreated control was included for comparison. Seeds were artificially inoculated with A. cassiae, treated with the different fungicides and percentage germination and infection was determined in vivo. Percentage emergence and disease incidence were also determined in greenhouse experiments. None of the treatments eradicated A. cassiae from cowpea seeds. Captab at 30 g/10l (1.5 x the recommended rate) proved to be the best treatment for reducing the pathogen.
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