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Effects of population density on alienicolae of Aphis fabae Scop.: The expression of migratory urge among alatae in the field
Author(s) -
SHAW M. J. P.
Publication year - 1973
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.1744-7348.1973.tb07716.x
Subject(s) - alate , aphis , biology , nymph , sugar beet , population , population density , horticulture , pest analysis , botany , homoptera , aphididae , aphid , demography , sociology
SUMMARY Alate Aphis fabae from field infestations on beans and sugar beet were tested for flight before parturition and divided into migrants, flyers and non‐flyers. More alatae were produced, fewer nymphs were deposited before flight and the proportions of migrants among alatae increased with population density on each of the three crops. After the population peak, proportions of migrants decreased, more interforms were produced and more nymphs were deposited before flight.