Abstract
The success of insecticides depends not only on their intrinsic physiological activity but on the way in which they are formulated. In recent field trials in Australia synthetic pyrethroid insecticides formulated as water-based emulsifiable concentrates (EC) were compared with oil-based ultra low volume (ULV) formulations for control of bollworm (Heliothis) on cotton. Contrary to expectation, EC formulations gave the better results under typical conditions for very low volume spraying in Australia.
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