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Laboratory and field evaluation of a fast acting insect growth regulator against the spruce budworm choristoneura fumiferana lepidoptera tortricidae



Laboratory and field evaluation of a fast acting insect growth regulator against the spruce budworm choristoneura fumiferana lepidoptera tortricidae



Canadian Entomologist 114(6): 523-530



UC-62644, a molt-inhibiting insect growth regulator (IGR) belonging to the benzoylphenylureas, had an EC50 of 0.1-0.2 ppm in meridic diet for the 3rd-6th larval instars of the spruce budworm, C. fumiferana Clemens. The effects of the IGR were apparent in < 48 h after ingestion and there was evidence for some contact toxicity. The larvae were unable to discriminate between IGR-treated and untreated diet. Experimental aerial application of the IGR revealed that at < 70 g in 4.7 l/ha (1 oz in 0.5 USA gal/acre) it effectively controlled spruce budworm populations and afforded foliage protection. These results were comparable with those obtained with Matacil applied at the recommended rate.

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