By: Maykuss, F.
Conditions affecting the intensity of tuber infection by Rhizoctonia solani are discussed, including soil conditions, humus content, organic fertilizing, crop rotation, cultivar, infected seed potatoes, and weather conditions. R. solani-infected tubers of 7 cultivars were treated with Monceren (pencycuron), Risolex (tolclofos-methyl), Dithane Ultra (mancozeb) and Tecto (thiabendazole), and planted in 9 field trials in 1987-90. Yields, tuber size and starch content, number of shoots per plant, number of stunted plants, occurrence of stem canker, black scurf on the tuber and tuber deformation were determined for fungicide-treated and untreated control tubers. Averaged over year and cultivar, pencycuron and Risolex significantly decreased black scurf. For the remaining parameters tuber treatment had beneficial but non-significant effects; differences between the fungicides were also small. From a cost-benefit analysis, it is recommended to use liquid fungicides and restrict their use to high value crops such as seed potatoes.
Conditions affecting the intensity of tuber infection by Rhizoctonia solani are discussed, including soil conditions, humus content, organic fertilizing, crop rotation, cultivar, infected seed potatoes, and weather conditions. R. solani-infected tubers of 7 cultivars were treated with Monceren (pencycuron), Risolex (tolclofos-methyl), Dithane Ultra (mancozeb) and Tecto (thiabendazole), and planted in 9 field trials in 1987-90. Yields, tuber size and starch content, number of shoots per plant, number of stunted plants, occurrence of stem canker, black scurf on the tuber and tuber deformation were determined for fungicide-treated and untreated control tubers. Averaged over year and cultivar, pencycuron and Risolex significantly decreased black scurf. For the remaining parameters tuber treatment had beneficial but non-significant effects; differences between the fungicides were also small. From a cost-benefit analysis, it is recommended to use liquid fungicides and restrict their use to high value crops such as seed potatoes.
Yangzhou pioneer chemical CO.,LTD
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