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Verbenone Bubble Caps Ineffective As A Preventive Strategy Against Mountain Pine Beetle Attacks In Ponderosa Pine, C. K. Lister, J. M. Schmid, S. A. Mata, D. Haneman, C. O'Neil, J. E. Pasek, L. Sower
Verbenone Bubble Caps Ineffective As A Preventive Strategy Against Mountain Pine Beetle Attacks In Ponderosa Pine, C. K. Lister, J. M. Schmid, S. A. Mata, D. Haneman, C. O'Neil, J. E. Pasek, L. Sower
Judith E Pasek
Verbenone capsules were stapled to trees in mountain pine beetle-infested stands of ponderosa pine at densities of 10, 20, 40, and 68 capsules per acre. Mean numbers of infested trees were not significantly different among treatments. Either the verbenone is not effective in repelling attacks or the formulation in the capsules needs to be modified to enhance its effectiveness. Verbenone capsules were not effective enough to be used in a preventive strategy.
Douglas-Fir Beetle Infestation Following The Clover Mist Fire On The Clarks Fork Ranger District, Shoshone National Forest, Wyoming, Judith Pasek
Judith E Pasek
In 1989, Douglas-fir beetle (DFB), Dendroctonus pseudotsugae Hopkins, was detected on the Clarks Fork Ranger District in large-diameter Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, trees blackened by the 1988 Clover Mist Fire. At Cathedral Cliffs and Squaw Creek, respectively, 22% and 32% of charred Douglas-firs greater than 10 in. DBH were infested; approximately 9 and 16 Douglas-fir trees per acre were infested, respectively. Although half the bark samples (6 in. by 6 in.) from infested trees contained no DFB brood, average brood production was high -- 9 and 7 callow adults per sample, respectively, at Cathedral Cliffs and Squaw Creek. Approximately …