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The role of grasslands in the yearly life‐cycle of Rhopalosiphum padi (Homoptera: Aphididae) in Sweden.
Author(s) -
WIKTELIUS S.
Publication year - 1987
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1987.tb03227.x
Subject(s) - rhopalosiphum padi , biology , homoptera , aphididae , aphid , agronomy , barley yellow dwarf , population density , population , botany , pest analysis , demography , plant virus , virus , virology , sociology
SUMMARY The population density of the bird cherry‐oat aphid ( Rhopalosiphum padi ) was monitored in spring sown barley and in grasslands (leys and pastures) and a suction trap was used to monitor the flight periodicity of the aphids. Emigrants from the primary host (bird cherry) colonised both grass and cereals in spring and a migration from cereals to grasses took place in mid‐summer. There was a negative correlation between the sizes of summer and autumn migration. There was a positive relationship between late summer growth in leys and the size of autumn migrations. It is concluded that the size of the autumn migration is mainly dependent on aphid population growth in grasslands during late summer and autumn.