Wada Satoko, Toyota Koki, Takada Atsushi
Graduate school of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan.
J Nematol. 2011 Mar;43(1):1-6.
The effects of the non-fumigant nematicide imicyafos on soil nematode community structure and damage to radish caused by Pratylenchus penetrans were evaluated in two field experiments in consecutive years (2007 and 2008). Nematode densities in soil at 0 - 10 cm (the depth of nematicide incorporation) and 10 - 30 cm were measured. The application of imicyafos had a significant impact on the density of P. penetrans at 0 - 10 cm but had no effect on free-living nematode density. PCR-DGGE analysis conducted using extracted nematodes showed that the nematode community structure 12 d after application in 2007 was altered by the application of imicyafos at the 0 - 10 cm depth, but not at 10 - 30 cm. No significant differences were observed in the diversity of the nematode community at harvest (89 and 91 d after application) between the control and imicyafos treatments in both depths and both years. In both years, the damage to radish caused by P. penetrans was markedly suppressed by the nematicide. Overall, the nematicide imicyafos decreased populations of P. penetrans in soil and thereby decreased damage to radish, while having little impact on the soil nematode community.
连续两年（2007年和2008年）在两个田间试验中评估了非熏蒸性杀线虫剂灭线磷对土壤线虫群落结构以及穿刺短体线虫对萝卜造成的损害的影响。测量了0至10厘米（杀线虫剂施入深度）和10至30厘米土壤中的线虫密度。灭线磷的施用对0至10厘米处的穿刺短体线虫密度有显著影响，但对自由生活线虫密度没有影响。使用提取的线虫进行的PCR-DGGE分析表明，2007年施药后12天，0至10厘米深度施用灭线磷改变了线虫群落结构，但10至30厘米深度未改变。在收获期（施药后89天和91天），两个深度以及两年的对照和灭线磷处理之间，线虫群落多样性均未观察到显著差异。两年中，灭线磷均显著抑制了穿刺短体线虫对萝卜造成的损害。总体而言，杀线虫剂灭线磷减少了土壤中穿刺短体线虫的数量，从而减少了对萝卜的损害，同时对土壤线虫群落影响较小。
