Abstract
AbstractThe activity of two insect growth disruptors PH 6038 and PH 6040 was assessed against larvae of the winter moth, Operophtera brumata (L.) in the laboratory and field. Larvae fed on foliage treated with PH 6038 and PH 6040 until death occurred at ecdysis owing to disruption in cuticle formation. Field tests with PH 6040 indicated that concentrations of 165 ppm were effective for control. As measured by bioassay, using winter moth larvae, PH 6040 was persistent for at least 28 days in the field.
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