Evaluations of Insecticides and Fungicides for Reducing Attack Rates of a new invasive ambrosia beetle (Euwallacea Sp., Coleoptera: Curculionidae: Scolytinae) in Infested Landscape Trees in California.

摘要: A recently discovered ambrosia beetle with the proposed common name of polyphagous shot hole borer (Euwallacea sp., Coleoptera: Curculionidae: Scolytinae), is reported to attack >200 host tree species in southern California, including many important native and urban landscape trees. This invasive beetle, along its associated fungi, causes branch dieback mortality a large variety sycamore (Platanus racemosa Nutt.). Due severity impact this Euwallacea short-term management tools must include chemical control options for arboriculture industry private landowners protect We examined effectiveness insecticides, fungicides, insecticide–fungicide combinations controlling continued sp. attacks on previously infested trees which were monitored 6 mo after treatment. Pesticide generally more effective than single pesticide treatments. The combination systemic insecticide (emamectin benzoate), contact (bifenthrin), fungicide (metconazole) provided some level when applied moderate heavily biological Bacillus subtilis control. There was no difference performance three triazole fungicides (propiconazole, tebuconazole, metconazole) included study. Although substantial over time, treatments may be are treated during early stages by beetle.