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Studies on the aphid, Cavariella aegopodii Scop. 1. On willow and carrot



Studies on the aphid, Cavariella aegopodii Scop. 1. On willow and carrot



Ann Appl Biol 56(3): 429-438



In 1959-64 biological studies were made on Cavariella aegopodii Scop., an important aphid pest of carrots. It wintered as eggs on all common willows (Salix spp.) in the English Midlands but more frequently on Salix alba and S. fragilis. Neither eggs nor fundatrices were found on Salix babylonica. Spring migration to carrots began in May and was over before July. April-sown carrots were the most severely attacked, damaging aphid populations sometimes developing on these within 6-7 wks from the onset of immigration. In July aphid numbers on carrots fell when winged alienicolae developed and dispersed. Some of the alienicolae flew to later-sown carrots and though they did little colonizing were probably important in spreading motley dwarf virus. Natural enemies did not check aphid multiplication: years of highest aphid numbers coincided with low rainfall over the first half of the spring migration period. Motley dwarf virus disease was most troublesome when C. aegopodii apterae survived on overwintered carrot crops.

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