Gray Elmer W, Fusco Robert A, Noblet Ray, Wyatt Roger D
Department of Entomology, The University of Georgia, 413 Biological Sciences Building, Athens, GA 30602, USA.
J Am Mosq Control Assoc. 2011 Jun;27(2):170-2. doi: 10.2987/10-6105.1.
The downstream movement, or drift, of larval black flies as well as many other aquatic insects has been well documented. This phenomenon has most often been associated with the dusk-to-overnight time frame. Operationally, larvicide applications targeting black flies are typically initiated early in the day and can extend until near sunset. To determine if larvicide applications conducted late in the day would be affected by the drift behavior of larval black flies, 6 larvicide applications were conducted. Three applications were conducted at midmorning and 3 during the evening. Larvicidal applications of Bacillus thuringiensis subsp. israelensis insecticidal proteins targeting Simulium appalachiense demonstrated no difference in larval mortality between morning and evening applications. These findings indicate that the larvae responded in a similar manner to the larvicide during the late morning to early afternoon and evening to night. The drift behavior of larval black flies does not appear to be an impediment to black fly suppression activities.
幼虫期黑蝇以及许多其他水生昆虫的下游移动，即漂移，已有充分记录。这种现象通常与黄昏至夜间的时间段相关。在实际操作中，针对黑蝇的杀幼虫剂施用通常在一天的早些时候开始，并且可以持续到接近日落时分。为了确定在一天晚些时候进行的杀幼虫剂施用是否会受到幼虫期黑蝇漂移行为的影响，进行了6次杀幼虫剂施用。3次在上午进行，3次在晚上进行。针对阿巴拉契亚蚋的苏云金芽孢杆菌以色列亚种杀虫蛋白的杀幼虫剂施用显示，上午和晚上施用的幼虫死亡率没有差异。这些发现表明，幼虫在上午晚些时候至下午早些时候以及晚上至夜间对杀幼虫剂的反应方式相似。幼虫期黑蝇的漂移行为似乎并不是抑制黑蝇活动的障碍。
