Physical Barriers to Reduce Damage by Lepesoma lecontei (Coleoptera - Curculionidae) to Conelets in a Douglas-fir Seed Orchard in Western Oregon

1991

6 Lit. Ang.

Unselbständiges Werk

10622

200091797

Damage to Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) conelets by Lepesoma lecontei (Casey) was significantly reduced by the application of a sticky barrier around the bole of the seed orchard trees. Early conelet injury was reduced from 25% in controls to 6% in sticky barrier treatments. No significant protection was observed in a test of a metal baffle placed around the bole. Significant treatment effect on cone survival could not be detected. Sticky barriers are a low-cost control that is highly pest specific and need be applied only to those trees producing a crop in a particular year.