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Control of Rhizoctonia solani Kuhn in potatoes by disinfection of seed tubers and by chemical treatment of the soil



Control of Rhizoctonia solani Kuhn in potatoes by disinfection of seed tubers and by chemical treatment of the soil



European Potato Jour 1(1): 52-64



Disinfection of seed tubers with proprietary organo-mercury compounds effectively controls Rhizoctonia solani in the seed potato growing area of Noord-Holland. The beneficial effect of disinfection is also produced if the seed tubers do not bear sclerotia, because the fungus inoculum may be present as mycelial threads in the cavities around the eyes. The methods of disinfection used did not damage the germinative powers of the seed tubers. Soil treatment with pentachloronitrobenzene at 60-90 kg active substance per ha or with mercuric chloride at 16 kg/ha also controls Rhizoctonia solani. Broadcasting the chemicals, at the time of planting is an effective method of application. If Rhizoctonia is not prevalent, the treated plots show a delayed emergence as compared with the untreated; this may result in loss of crop. The amount of black scurf occurring on the tubers increases with the time they are left in the soil.

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