Abstract
Abstract To determine their importance as virus vectors, 1419 alate aphids were collected, mainly from field plots of garden peas (Pisum sativum L. var. sativum L.) in spring 1966, 1967, and 1968; 55% were Aulacorthum solani (Kltb.), 25% Myzus persicae (Sulz.), 16% Macrosiphum euphorbiae (Thos.), and 3% Aphis craccivora Koch. Alatae of each species were transferred either singly or in groups to subterranean clover (Trifolium subterraneum cv. Bacchus Marsh) test plants. The viruses detected and their vectors were: a. Subterranean clover red leaf virus (SCRLV), which caused the leaves of the test plant to be small and turn red as they matured. Alatae of A. solani often infected plants with SCRLV, and alatae of M. euphorbiae did so occasionally. In glasshouse tests SCRLV was transmitted circulatively by apterae of A. solani but not by apterae of M. persicae or A. craccivora, although M. persicae appeared to transmit SCRLV when PELRV was also present. b. Pea leaf roll virus (PELRV), which caused marked stunti...
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