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The effect of planting date and spacing on the incidence of groundnut rosette disease and of the vector, Aphis craccivora Koch, at Mokwa, Northern Nigeria
Author(s) -
A'BROOK JOHN
Publication year - 1964
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.1744-7348.1964.tb01184.x
Subject(s) - aphis craccivora , biology , sowing , rosette (schizont appearance) , agronomy , aphid , crop , population , incidence (geometry) , horticulture , homoptera , pest analysis , aphididae , mathematics , demography , geometry , immunology , sociology
SUMMARY At Mokwa in Northern Nigeria early planting and close spacing increased the yield of groundnuts and decreased rosette incidence. With late planting, increasing the plant population reduced both the rosette incidence and the number of aphid‐infested plants. It is suggested that winged Aphis craccivora Koch bring the virus into the crop, and that spacing and planting date affect rosette incidence because of the influence of groundcover on the optomotor landing response of the winged aphids.