Abstract
The effectiveness of carbaryl in protecting high-value ponderosa pine trees from attack by Dendroctonus brevicomis LeConte was tested at reduced concentrations or for longer than one beetle flight season. A 2.0% suspension of carbaryl provided substantial protection of ponderosa pine from attack by D. brevicomis for the 5 months adults are actively attacking trees. Lesser concentrations, notably 1.0 and 0.5%, provided some protection but with greater tree mortality. Neither 2.0% Sevimol® nor 2.0% Sevin XLR® provided adequate protection for 9 or 12 months, respectively, after application.
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