Hawk Tracy, Faske Travis R
Division of Agriculture, Lonoke Extension Center, University of Arkansas, Lonoke, AR, 72086.
J Nematol. 2020 Aug 25;52. doi: 10.21307/jofnem-2020-083. eCollection 2020.
Fluopyram is being used to manage plant-parasitic nematodes in cotton () and soybean (), but the duration and depth of root protection from by seed-applied fluopyram is unknown. Both susceptible cotton, Stoneville 'ST 4848 GLT', and soybean, Delta Grow 'DG 4880 GLY', cultivars were treated with fluopyram or abamectin and inoculated with second-stage juveniles in two greenhouse studies. Root penetration by was suppressed from 7 to 21 d after planting by seed-applied fluopyram in soybean, while a similar trend in suppression was observed in cotton. Fewer nematodes per root system by fluopyram contributed to a reduction in root gall counts and nematode reproduction at 28 and 35 d after planting in both crops. Based on nematode developmental stages from 7 to 21 d after planting, fluopyram had no effect on nematode maturity. Root penetration by was suppressed at 7 d after planting by fluopyram at a depth up to 5.0 cm in cotton and 2.5 cm in soybean. These results were similar to that of abamectin-treated seed. Seed-applied fluopyram and abamectin were most effective at suppressing nematode root entry rather than nematode maturity in cotton and soybean.
氟吡菌酰胺正被用于防治棉花和大豆中的植物寄生线虫，但种子处理氟吡菌酰胺对根系的保护持续时间和深度尚不清楚。在两项温室研究中，对敏感棉花品种斯通维尔“ST 4848 GLT”和大豆品种三角洲种植“DG 4880 GLY”均用氟吡菌酰胺或阿维菌素处理，并接种二期幼虫。种子处理氟吡菌酰胺在大豆种植后7至21天抑制了线虫的根系侵入，棉花中也观察到了类似的抑制趋势。种植后28天和35天，氟吡菌酰胺使每个根系中的线虫数量减少，从而使两种作物的根瘤数量减少以及线虫繁殖量降低。根据种植后7至21天的线虫发育阶段，氟吡菌酰胺对线虫成熟没有影响。种植后7天，氟吡菌酰胺在棉花中可抑制线虫在深度达5.0厘米处的根系侵入，在大豆中可抑制线虫在深度达2.5厘米处的根系侵入。这些结果与阿维菌素处理种子的结果相似。种子处理氟吡菌酰胺和阿维菌素在抑制棉花和大豆中线虫的根系侵入方面最为有效，而非线虫成熟方面。
