oa Journal of the Entomological Society of Southern Africa - Notes on potato aphids and leaf roll spread at Rietriver Irrigation Scheme, South Africa
Previous reports (Daiber, 1962, 1964) have dealt with the population dynamics of potato aphids and the leaf roll spread at Rietvlei Experiment Station on the Transvaal Highveld. The experiments showed a high leaf roll spread as has been observed in potatoes on the Transvaal Highveld for many years. To obtain high yields Highveld farmers are compelled to buy virus-free seed potatoes every year. Seed potatoes are multiplied in the northern Cape Province, and Rietriver Experiment Station was selected during the war to provide the seed potato producers with mother seed, since an aphid survey had shown very low numbers of Myzus persicae (Sulzer) on the foliage at Rietriver (van der Plank, 1944; van der Plank & Wasserman, 1945). After some years of successful seed potato production at Rietriver, leaf roll incidence increased seriously there in seed potatoes during the late 1950's.
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