Suh C P C, Armstrong J S, Spurgeon D W, Duke S
Areawide Pest Management Research Unit, USDA-ARS, 2771 F&B Rd., College Station, TX 77845, USA.
J Econ Entomol. 2009 Feb;102(1):183-6. doi: 10.1603/029.102.0126.
Boll weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), eradication programs typically equip pheromone traps with an insecticide-impregnated kill strip. These strips are intended to kill captured insects, thereby simplifying trap servicing and reducing the loss of weevils from predation and escape. However, the effectiveness of kill strips has not been extensively evaluated. We examined the influences of kill strips on weevil captures, trap servicing, and the incidences of weevil predation and trap obstruction (e.g., by spider webs). Evaluations were conducted weekly during three different production periods (pre- to early-, late-, and postseason) of cotton, Gossypium hirsutum L., to represent different environmental conditions and weevil population levels. Within each period, mean weekly captures of weevils in traps with and without kill strips were statistically similar. On average, traps with kill strips took 9 s longer to service than traps without kill strips, but statistical differences were only detected during the late-season period. Overall, the mean weekly proportion of traps with evidence of weevil predation or trap obstruction was significantly lower for traps with kill strips (0.25) than for traps without kill strips (0.37). However, this reduction in the frequency of weevil predation or trap obstruction was too small to produce a corresponding increase in the numbers of weevils captured. In light of these findings, the use of kill strips is likely unnecessary in eradication programs, but may be a consideration in situations when the numbers of deployed traps are reduced and chronic problems with weevil predation or trap obstruction exist.
棉铃象甲，即墨西哥棉铃象甲（Anthonomus grandis grandis Boheman，鞘翅目：象甲科），根除计划通常会在性诱捕器中配备浸有杀虫剂的捕杀条。这些捕杀条旨在杀死捕获的昆虫，从而简化诱捕器维护工作，并减少象甲因被捕食和逃脱造成的损失。然而，捕杀条的有效性尚未得到广泛评估。我们研究了捕杀条对象甲捕获量、诱捕器维护以及象甲被捕食和诱捕器受阻（如被蜘蛛网）发生率的影响。在棉花（陆地棉，Gossypium hirsutum L.）的三个不同生产时期（前期至早期、后期和收获后期）每周进行评估，以代表不同的环境条件和象甲种群水平。在每个时期内，有捕杀条和没有捕杀条的诱捕器中象甲的平均每周捕获量在统计学上相似。平均而言，有捕杀条的诱捕器维护时间比没有捕杀条的诱捕器长9秒，但仅在后期阶段检测到统计学差异。总体而言，有捕杀条的诱捕器中发现有象甲被捕食或诱捕器受阻迹象的平均每周比例（0.25）显著低于没有捕杀条的诱捕器（0.37）。然而，象甲被捕食或诱捕器受阻频率的这种降低太小，无法相应增加捕获的象甲数量。鉴于这些发现，在根除计划中可能无需使用捕杀条，但在部署的诱捕器数量减少且存在象甲被捕食或诱捕器受阻的长期问题的情况下，可能需要考虑使用。
