The oblique banded leafroller, Choristoneura rosaceana Harris (Lepidoptera: Tortricidae), has become an important pest of apple orchards since it has developed resistance to several synthetic insecticides registered in North America. Kaolin (or formulated clay particles) may be a viable alternative, but little is known of its sublethal effects. Two laboratory experiments were done. In the first experiment, to examine ingestion effects, kaolin was mixed with articifical diet at various concentrations and fed to neonate larvae. In a second experiment kaolin was sprayed on host plant leaves at various concentrations to determine its effects as a physical barrier and from ingestion. In both experiments the time to pupation, pupal mortality rate and pupal mass were recorded.
Species 1: Lepidoptera Tortricidae Choristoneura rosaceana (Obliquebanded leafroller)
Keywords: kaolin
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