Peterson Chris J
USDA Forest Service, Wood Products Insect Research Unit, Starkville, MS 39759, USA.
Pest Manag Sci. 2007 Nov;63(11):1124-32. doi: 10.1002/ps.1433.
The mobility, longevity and termiticidal activity of imidacloprid (Premise 2 termiticide; Bayer Environmental Sciences) at the termiticidal labeled rate for perimeter treatment were tested in vegetated and non-vegetated soil columns in two tests: in cone plots and in polyvinyl chloride (PVC) pipes. Imidacloprid content in the cone plot eluate peaked at 1 month, declined rapidly by the second month and then entered a lagging phase. The concentration of imidacloprid in the cone plot soil declined from 84.5 microg g(-1) initially to 7.5 microg g(-1) (non-vegetated plots) and 8.1 microg g(-1) (vegetated plots) 6 months later. Neither eluate concentration nor soil concentration was affected by the presence of vegetation in the cone plots. In the PVC pipes, the top 15 cm of which was treated with Premise 2 at the perimeter labeled rate, imidacloprid half-life was estimated at 6-9 months for vegetated and non-vegetated soil. Extractable imidacloprid declined more rapidly in the first 15 months than afterwards. Mobility of imidacloprid into lower, untreated soil depths was higher in non-vegetated pipes, and was likely due to the effect of vegetation on soil moisture. The presence of vegetation had little effect on the termiticidal activity of treated soil in the PVC pipes.
以用于周边处理的杀白蚁剂标签剂量，在两个试验中，于植被覆盖和无植被覆盖的土柱中测试了吡虫啉（Premise 2杀白蚁剂；拜耳环境科学公司）的迁移性、持久性和杀白蚁活性：在圆锥试验小区和聚氯乙烯（PVC）管中进行测试。圆锥试验小区洗脱液中的吡虫啉含量在1个月时达到峰值，到第2个月迅速下降，然后进入一个滞后阶段。6个月后，圆锥试验小区土壤中的吡虫啉浓度从最初的84.5微克/克分别降至7.5微克/克（无植被覆盖小区）和8.1微克/克（植被覆盖小区）。圆锥试验小区中植被的存在对洗脱液浓度和土壤浓度均无影响。在PVC管中，其顶部15厘米以周边标签剂量用Premise 2处理，对于植被覆盖和无植被覆盖的土壤，吡虫啉的半衰期估计为6 - 9个月。在前15个月中，可提取的吡虫啉下降速度比之后更快。在无植被覆盖的管道中，吡虫啉向下迁移至未处理土壤深层的迁移性更高，这可能是由于植被对土壤湿度的影响。植被的存在对PVC管中经处理土壤的杀白蚁活性影响不大。
