Ali A, Kok-Yokomi M L, Alexander J B
University of Florida, IFAS, Sanford, FL 32771-9608.
J Am Mosq Control Assoc. 1991 Jun;7(2):287-9.
Vertical distribution of immature Psychoda alternata in soil to a depth of 15 cm was studied in Jacksonville, FL. Samples were randomly taken from large circular land areas receiving a brewery wastewater utilized for commercial turf cultivation and included turfed and bare habitats. Total organic matter was quantified at various soil depths. Overall, 88.5 and 95.8% larvae and 91.3 and 94.0% pupae were recovered from the top 2.5 cm of soil at turfed and bare habitats, respectively. The highest concentration of total organic matter at both habitat types was in the top 2.5 cm. There were strong positive relationships between the number of larvae and pupae and total organic matter, indicating highest concentrations of immatures in nutrient-rich topsoil with an abundant supply of larval food. We suggest that insecticidal treatment directed against immature P. alternata breeding in such habitats need not penetrate to a depth of more than a few centimeters to affect almost all of the population of this pestiferous insect.
在佛罗里达州杰克逊维尔，研究了未成熟的交替脉毛蚊在土壤中至15厘米深度的垂直分布情况。样本从用于商业草坪种植的、接收啤酒厂废水的大型圆形陆地区域随机采集，包括有草皮和裸露的栖息地。对不同土壤深度的总有机质进行了量化。总体而言，在有草皮和裸露的栖息地，分别有88.5%和95.8%的幼虫以及91.3%和94.0%的蛹是从土壤表层2.5厘米处采集到的。两种栖息地类型中总有机质的最高浓度都在表层2.5厘米处。幼虫和蛹的数量与总有机质之间存在很强的正相关关系，这表明在营养丰富、幼虫食物供应充足的表土中，未成熟个体的浓度最高。我们建议，针对在这类栖息地繁殖的未成熟交替脉毛蚊的杀虫处理，无需穿透超过几厘米的深度就能影响这种害虫的几乎所有种群。
