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Section 6. Pyrethroid resistance: field selection in sorghum
Published online by Cambridge University Press: 20 September 2013
Summary
Pyrethroids applied to flowering sorghum, at either the low midge rate or the higher Helicoverpa rate (20 g and 100 g fenvalerate a.i./ha, respectively), caused selective mortality of Helicoverpa armigera larvae and resulted in differential selection for resistance. This finding vindicated the original strategy decision to apply the same temporal restrictions on pyrethroid use for sorghum midge, Contarinia sorghicola, as those for H. armigera.
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