Evaluation of Two Trap Log Techniques For Ambrosia Beetles (Coleoptera: Scolytidae) in Timber Processing Areas

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Abstract
Two experiments evaluating the efficiency of pheromone-baited and blank, untreated or lindane-treated trap logs (logs) against pheromone-baited sticky traps (traps) as tools for management of ambrosia beetles were conducted in a Pacific coast dryland sorting area. Pheromone-baited or blank, untreated logs were as efficient as pheromone-baited traps for Trypodendron lineatum (Olivier) females early in the season and remained relatively efficient up to 4 weeks, after which they were inferior to traps. For the total 12-week experiment, pheromone-baited traps were more efficient than logs for male Gnathotrichus retusus LeConte, or blank logs for T. lineatum, and equal to logs for G. sulcatus LeConte. Pheromone-baited traps were more effective than lindane-treated logs throughout the 12-week experiment for female G. sulcatus. after 4 weeks for T. lineatum and male G. sulcatus, but only for 4 weeks in the middle of the experiment for G. retusus. For the total experiment, traps were superior to lindane-treated logs for G. sulcatus. whereas there was no significant difference for the other two species. Unbaited logs were inefficient. The use of untreated (no pesticide) logs early in the spring as a supplement to pheromone-baited traps would improve the efficiency of ambrosia beetle management in timber processing areas.