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- W2034370287 abstract "Heliothis armigera is a serious pest in Botswana. Preparations of a local nuclear-polyhedrosis virus and Bacillus thuringiensis (Biotrol BTB-183) are being considered as treatments for control of this pest. Laboratory bioassays of these two preparations were carried out to provide a firm basis for comparison with past field trials and a standard for future field testing. The LC50 of the virus and LD50 of B. thuringiensis were found to compare favorably with those for similar materials against closely and distantly related lepidopterous pests. The majority of larvae were killed very rapidly by the B. thuringiensis, although some survived up to 14 days before death. The minimum time to mortality for the virus was 4 days. B. thuringiensis lowered the weight of both male and female surviving pupae, whereas the virus had no significant effect on its survivors. Concentrations of the two materials calculated from the LC90 and LD90 were considerably lower than those already found to give some or good control of H. armigera on sorghum. Improved spray coverage and protection of the materials against environmental degradation are required if spraying concentrations are to be reduced and yet remain effective." @default.
- W2034370287 created "2016-06-24" @default.
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- W2034370287 date "1974-05-01" @default.
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- W2034370287 title "Bioassay of a nuclear-polyhedrosis virus and Bacillus thuringiensis against the American bollworm, Heliothis armigera, in Botswana" @default.
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- W2034370287 doi "https://doi.org/10.1016/0022-2011(74)90096-2" @default.
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