United States Department of Agriculture, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS 66502, USA.
J Econ Entomol. 2010 Jun;103(3):1002-11. doi: 10.1603/ec09348.
Structural fumigations of food processing plants to manage stored-product insects has been a major component of pest management programs, but limited information on field efficacy is available. Efficacy, based on pheromone trapping data, consists of initial reduction in captures after treatment and rebound in trap captures over time. Pattern of Tribolium castaneum (Herbst) rebound was evaluated after 21 fumigations in two flour mills. Rebound in mean number of beetles captured and the probability of a trap capturing one or more beetles was evaluated. Rebound to a threshold mean beetle capture of 2.5 beetles per trap per 2-wk period took 174 +/- 33 d and rebound took longer after fall (248 +/- 50 d) than spring (104 +/- 21 d) fumigations. Rebound to the probability of capture threshold of 0.50 was 120 +/- 21 d, but there was no significant effect of season. Improvement in integrated pest management (IPM) practices in one of the mills was associated with an increase in time to reach mean beetle capture threshold (49 +/- 15 d before and 246 +/- 71 d after) but not in time to reach the probability of capture threshold (38 +/- 14 d before and 165 +/- 46 d after). There was a negative correlation between number captured after fumigation and time to rebound to threshold. After improved IPM there was a significant reduction in the number of beetles per trap immediately after fumigation. Above these two thresholds the degree of change in trap captures is significantly greater than below, which suggests they might be useful in evaluating risk in a pest management program.
对食品加工厂进行结构性熏蒸以防治仓储性害虫一直是害虫管理计划的主要组成部分，但有关田间功效的信息有限。根据信息素诱捕数据得出的功效包括处理后捕获量的初始减少，以及随着时间的推移诱捕量的反弹。在两个面粉厂进行了 21 次熏蒸后，评估了赤拟谷盗（Herbst）反弹的模式。评估了捕获的平均甲虫数量和诱捕器捕获一只或多只甲虫的概率的反弹情况。反弹到每两周每诱捕器捕获 2.5 只甲虫的平均捕获阈值需要 174 +/- 33 天，秋季（248 +/- 50 天）比春季（104 +/- 21 天）熏蒸后的反弹时间更长。反弹到捕获阈值 0.50 的概率为 120 +/- 21 天，但季节没有显著影响。其中一个工厂综合虫害管理（IPM）实践的改进与达到平均甲虫捕获阈值所需的时间增加有关（改进前为 49 +/- 15 天，改进后为 246 +/- 71 天），但与达到捕获阈值的概率无关（改进前为 38 +/- 14 天，改进后为 165 +/- 46 天）。熏蒸后捕获的甲虫数量与反弹到阈值的时间之间存在负相关。在改进 IPM 之后，立即在熏蒸后，每个诱捕器中的甲虫数量显著减少。在这两个阈值之上，诱捕器捕获量的变化程度明显大于以下阈值，这表明它们可能在害虫管理计划中评估风险时很有用。
