The effect of seed-and soilborne inoculum ofColletotrichum coccodes on the incidence of black dot on potatoes |
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Authors: | F D N Denner C P Millard F C Wehner |
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Institution: | (1) Agricultural Research Council, Roodeplaat Vegetable and Ornamental Plant Institute, Private Bag X293, 0001 Pretoria, Republic of South Africa;(2) Department of Microbiology and Plant Pathology, University of Pretoria, 0002, Republic of South Africa |
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Abstract: | Summary Soil in a potato field naturally infested with black dot (Colletotrichum coccodes) was fumigated with methyl bromide at 126 g m−2 or left unfumigated. Potato seed tubers (cv. BP1) uninfected, lightly infected (1–25% surface affected), severely infected
(26–100% surface affected) and severely infected withC. coccodes but dusted with prochloraz manganese chloride as Octave 2.5% DP at 750 g per 100 kg seed were planted in fumigated and unfumigated
soil. When harvested, the incidence of black dot on the progeny of infected seed planted in unfumigated soil was twice that
of progeny in fumigated soil, with progeny of uninfected seed having a 68.5 times higher disease incidence in unfumigated
soil. Black dot on progeny tubers was reduced by pre-treatment of seed with prochloraz in fumigated soil only. With black
dot infested fields, planting disease-free seed or treating seed with fungicides would not decrease disease on progeny tubers. |
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Keywords: | prochloraz Solanum tuberosum L soil treatment |
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