The antiaggregation pheromone, BEETLEBLOCK MCH, is highly effective in repelling Douglas fir beetle, Dendroctonus pseudotsugae, and preventing the infestation of trees by Douglas fir beetle.

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Beetleblock MCH, Available Now! EPA Registered Product 2015, Directly from Manufacturer Douglas Fir Beetle Dendroctonus pseudotsugae. We will Beat any comparable offer! Chemtica USA / Chemtica Internacional Beetle Block Chemtica 2015.
The antiaggregation pheromone, BEETLEBLOCK MCH, is highly effective in repelling Douglas fir beetle, Dendroctonus pseudotsugae, and preventing the infestation of trees by Douglas fir beetle. MCH has been used operationally in the Pacific Northwest and Rocky Mountains since 2000 to protect high-valued trees and stands from Douglas fir beetle infestation. MCH is applied in the spring before Douglas fir beetle flight, which usually begins between late April and mid-May in the interior Pacific Northwest and Rocky Mountains depending upon weather and elevation. The pheromone is formulated in plastic bubble dispensers that are stapled to trees in a grid pattern in the area to be treated. The pheromone elutes from the bubble dispensers throughout the main flight period which occurs between mid May and early July. Because Douglas fir beetle outbreaks last several years, stands need to be treated each spring as long as Douglas fir beetle populations remain high. In a recent study BEETLEBLOCK MCH decreased Douglas fir beetle in infested stands by 90% and decreased infested trees from 12.6/ha to zero. (High Release Rate 3-Methylcyclohex-2-en-1-one Dispensers Prevent Douglas-Fir Beetle (Coleoptera: Curculionidae) Infestation of Live Douglas-Fir, D. W. ROSS AND K. F. WALLIN, Department of Forest Science, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331-5752, J. Econ. Entomol. 101(6): 1826-1830 (2008) Directions for application: Staple BEETLEBLOCK-MCH dispensers 6 – 12 feet above the ground to the north side of standing Douglas-fir or spruce trees. Place the dispensers on susceptible trees in a grid pattern. An average dose is 40 dispensers per acre or 100 dispensers / hectare [10 meter grid]. Please read instructions before use.