Treatment of seed potatoes with prochloraz for simultaneous control of silver scurf and black dot on progeny tubers |
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| Authors: | F D N Denner Cornel Millard A Geldenhuys 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) Agrevo, South Africa (Pty) Ltd, Halfway House, 1685, P.O. Box 6065, Republic of South Africa;(3) Department of Microbiology and Plant Pathology, University of Pretoria, 0002, Republic of South Africa |
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| Abstract: | Summary Potato seed tubers infected withHelminthosporium solani andColletotrichum coccodes were treated with prochloraz (as Omega 450 g a.i. l−1 EC) and/or prochloraz managanese chloride (as Octave 25 g/kg DP), and planted in two separate fields not previously cultivated
with potatoes. Dipping seed 28 d prior to planting in 2,4 or 6 g a.i. l−1 Omega, and dusting with 500 or 750 g Octave per 100 kg seed significantly reduced the incidence of silver scurf and black
dot on progeny tubers. In one field, the higher concentrations of Omega and Octave gave slightly better control than the lower
Omega concentrations. At the second site, postharvest application of 4 g a.i. l−1 Omega or 750 g Octave per 100 kg seed limited development of both diseases on progeny tubers, with slightly better control
when an additional Octave dusting was applied 14 d before planting. None of the prochloraz treatments adversely affected plant
stand or tuber yield. |
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| Keywords: | Solanum tuberosum L Helminthosporium solani Colletotrichum coccodes |
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