Aphids on potato foliage in Sweden and their importance as vectors of potato virus Y0
1990
Sigvald, R. (Sveriges Lantbruksuniv., Uppsala (Sweden). Konsulentavd. Vaextskydd)
The aphid population on potato plants was estimated by counting aphids on 100 randomly chosen leaves from upper, middle, and lower parts of the plant. This was usually done during a period of 14 days in mid-July in 5-10 potato fields in each of 5 to 7 regions in southern and central Sweden from 1975 to 1980. The aphid population on potato plants varied considerably between years and regions from 0.1 to 20 aphids per leaf in most areas and years. Aphis nasturtii and Aphis franquale were the dominating aphid species and 99 to 10% of the apterous population consisted of these two species, but Myzus persicae, Macrosiphum euphorbiae and Aulacorthum solani were also present in small numbers. The association between the occurrence of apterous aphids on potato foliage and spread of potato virus Y0 was very weak
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