Efficacy of pesticides on the western spotted tentiform leafminer (Lepidoptera: Gracillariidae) in the Pacific Northwest
Keywords:
western spotted tentiform leafminer, <i>Phyllonorycter elmaella</i>, Lepidoptera, GracillariidaeAbstract
A serious infestation of the western spotted tentiform leafminer, <i>Phyllonorycter elmaella</i> Doganlar and Mutuura, was discovered in a commercial apple orchard in southeastern Washington in 1980. By 1983, the insect was found in many orchards in Washington, northern Oregon, and parts of Idaho on the foliage of apple, cherry, pear, and prune trees. A number of insecticides were tested against the leafminer in the Kennewick, Pasco, Prosser, and Moxee areas of Washington during 1983 and 1984. In one orchard, early season control was best with oxamyl, permethrin, cypermethrin and diflubenzuron. In another orchard, oxamyl, endosulfan at pink stage, an endosulfan-methoxychlor mix applied in midJune and fenvalerate applied in April were all highly effective in controlling leafminers. Diflubenzuron, permethrin, chlorpyrifos, and FMC 54800, all controlled leafminers. Aldicarb, a systemic insecticide, provided good control. Efficacy tests show that with proper timing, many materials effectively reduce leafminer populations.References
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