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FIELD EXPERIMENTS ON THE CONTROL OF APHIS‐TRANSMITTED VIRUS DISEASES OF HYOSCYAMUS NIGER
Author(s) -
WATSONHAMILTON MARION A.
Publication year - 1937
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.1744-7348.1937.tb05853.x
Subject(s) - biology , aphis , infestation , horticulture , crop , agronomy , veterinary medicine , aphid , toxicology , medicine
S ummary1 Aphis infestation of the first‐year's growth of Hyoscyamus niger grown as a biennial crop, was reduced by spraying with a solution of nicotine and soft soap for the first 8 or 9 weeks. 2 The greatest effect was obtained by spraying at weekly intervals, but spraying fortnightly and spraying weekly in June or weekly in July, also slightly reduced the infestation. 3 The percentage of infection by aphis‐transmitted viruses was lower on the sprayed plots than on the unsprayed. 4 No effect of treatments on yield was obtained at the first cropping in the first year of growth which coincided with the end of the spraying period. 5 As a result of weekly spraying in the first year a 30 per cent increase of yield was obtained in the third crop taken in May of the second year.