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The effect of sowing date and spacing on rosette disease of groundnut in Northern Nigeria, with observations on the vector, Aphis craccivora
Author(s) -
BOOKER R. H.
Publication year - 1963
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.1744-7348.1963.tb03734.x
Subject(s) - biology , aphis craccivora , sowing , acre , agronomy , aphid , crop , homoptera , horticulture , pest analysis , aphididae
SUMMARY In Northern Nigeria, groundnuts planted in June outyielded those planted in July, and, in rows I yard apart, plants spaced at 9 in. gave a heavier total crop than those at 18 in. In two experiments, early sowing reduced the number of rosetted plants per acre; close spacing merely reduced the percentage of plants infected. There was a correlation between the total of aphid‐infested plants during the growing period and the number of diseased plants. Late‐sown crops support more Aphis maccivora , both apterae and alatae. The principal host of the vector during the 6 months dry season is Euphorbia hirta , whereas in East Africa groundnut is the principal host throughout the year. A list of predators is given, with observations on relative numbers of syrphid larvae and aphids.