Abstract
SUMMARYPlots of potatoes in eastern England were covered at planting with finely slit, clear polyethylene film which remained over the foliage until harvest. Spread of potato virus Y and the numbers of aphids on the leaves in these plots were compared with those in uncovered plots. In two years fewer tubers of covered plants were infected with potato virus Y and in the first year the covered plants had fewer Myzus persicae(Sulz.) and Macrosiphum euphorbiae (Thos.).
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