Effect of diatomaceous earth, malathion, dimethoate and permethrin on <i>Leploglossus occidentalis</i> (Hemiptera: Coreidae), a pest of conifer seed


  • D. Summers Silviculture Branch British Columbia Ministry of Forests & Lands Victoria, B.C.
  • D. S. Ruth Pacific Forestry Centre, Canadian Forestry Service Victoria, B.C.


<i>Leploglossus occidentalis</i>, Hemiptera, Coreidae


<i>Leptoglossus occidentalis</i> Heidemann (Hemiptera: Coreidae) were exposed to diatomaceous earth, and sprays of dimethoate (0.1 and 1.0% a.i.) and permethrin (0.1% and 0.01% a.i.) in both laboratory and field tests and to malathion (0.1% a.i.) in a laboratory test. In field tests, permethrin and dimethoate caused significant (P < .05) mortality for two weeks after the sprays were applied and permethrin continued to be effective for a third week. Diatomaceous earth was not effective in field tests or in one of two laboratory tests. Malathion, dimethoate and permethrin caused significant mortality in both laboratory tests.


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