Shepherd William P, Sullivan Brian T
USDA Forest Service, Southern Research Station, Pineville, LA.
J Insect Sci. 2018 Jan 1;18(1). doi: 10.1093/jisesa/iex106.
Local outbreak risk for the southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae), is forecast with a trapping survey conducted every spring throughout the southeastern United States. Traps baited with pine odors and components of the D. frontalis aggregation pheromone are used to obtain abundance estimates of both this species and its clerid predator Thanasimus dubius (F.) (Coleoptera: Cleridae); these data are entered into a predictive model that estimates outbreak risk. An attractant synergist for D. frontalis, endo-brevicomin, has recently been included in the survey lure, but it can have the unintended effect of attracting nontarget species Hylesinus pruinosus Eichhoff (Coleoptera: Curculionidae: Scolytinae) and Enoclerus nigripes (Say) (Coleoptera: Cleridae) which, due to their sometimes large numbers and general similarity in appearance to the target species, could complicate sorting and counting of trap catches. Analysis of bycatch data from a previously-published, 31-mo trapping study in Mississippi indicated that displacement of the endo-brevicomin releaser 6 m from the trap largely eliminated catches of the nontarget species H. pruinosus and E. nigripes while not reducing catches of the target species D. frontalis and T. dubius. Our analysis demonstrates that interspecific differences in spatial responses to attractive semiochemicals can be used to improve insect trap selectivity. Both nontarget beetle species were captured in highest numbers during late winter/early spring, coinciding with the D. frontalis survey.
美国东南部每年春季都会开展诱捕调查，以预测南方松甲虫（Dendroctonus frontalis Zimmermann，鞘翅目：象甲科）的局部爆发风险。用松树气味和南方松甲虫聚集信息素成分诱捕的诱捕器，用于获取该物种及其食虫性天敌拟郭公虫（Thanasimus dubius (F.)，鞘翅目：郭公虫科）的数量估计；这些数据被输入到一个预测模型中，以估计爆发风险。一种南方松甲虫引诱增效剂——内 - 短叶松素，最近已被纳入调查诱捕剂中，但它可能会产生意想不到的效果，即吸引非目标物种——绒毛材小蠹（Hylesinus pruinosus Eichhoff，鞘翅目：象甲科：小蠹亚科）和黑足食虫虻（Enoclerus nigripes (Say)，鞘翅目：郭公虫科），由于它们有时数量众多且外观与目标物种总体相似，可能会使诱捕器捕获物的分类和计数变得复杂。对之前发表的一项在密西西比州进行的为期31个月的诱捕研究中的兼捕数据进行分析表明，将内 - 短叶松素释放器从诱捕器移开6米，在很大程度上消除了非目标物种绒毛材小蠹和黑足食虫虻的捕获量，同时又不减少目标物种南方松甲虫和拟郭公虫的捕获量。我们的分析表明，对有吸引力的信息化合物的空间反应中的种间差异可用于提高昆虫诱捕器的选择性。这两种非目标甲虫物种在冬末/早春捕获量最高，这与南方松甲虫调查时间一致。
