Contact activity of synthetic pyrethroids against adult grass grub,Costelytra zealandica (white) |
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| Authors: | Ronald F Henzell Denis R Lauren |
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| Abstract: | The field life for contact activity of cypermethrin and permethrin, applied to pasture, was similar for all of five application rates between 0.25 and 1.5 kg ha?1. Laboratory bioassays with grass grub beetles, Costelytra zealandica (White), showed that the insecticides lost their activity after about 4–9 days on pasture. Microencapsulation significantly increased the active field life of permethrin. |
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