Abstract:For several decades, the twospotted spider mite, Tetranychus urticae, was the only economically important spider mite species reported on red raspberry in Washington state. Researchers in the Pacific ...For several decades, the twospotted spider mite, Tetranychus urticae, was the only economically important spider mite species reported on red raspberry in Washington state. Researchers in the Pacific Northwest have shown that serious economic levels of this species can occur when growers use certain insecticides against pests such as root weevils and worms before harvest. When using insecticides known to kill the spider mite destroyer, Stethorus punctum picipes, growers remove an important predator population. Four species of spider mites now occur in red raspberry in Washington state. Yellow spider mite, Eotetranychus borealis carpini, was first reported in 1992; European red mite, Panonychus ulmi, in 1995 from Whatcom and Skagit counties; and the McDaniel spider mite, Tetranychus mcdanieli, in 1997 from Clark County. Growers can manage serious spider mite infestations in red raspberry using selective pesticides known to be safe to natural enemies. If growers do not control spider mites, defoliation in early fall will induce fruiting buds to develop prematurely, subjecting primocanes to winter injury, and causing indirect economic damage.Read More
Publication Year: 2003
Publication Date: 2003-07-01
Language: en
Type: article
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Cited By Count: 2
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