Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A.
Genetics Graduate Program, Michigan State University, East Lansing, MI 48824, U.S.A.
Plant Dis. 2020 May;104(5):1305-1311. doi: 10.1094/PDIS-04-19-0874-RE. Epub 2020 Mar 10.
The soybean cyst nematode (SCN), Ichinohe, causes significant damage to soybean production annually. Fluopyram is a fungicide commonly used in soybean seed treatments intended to control soilborne fungal pathogens; however, recent studies have also suggested inhibitory effects on SCN. We examined the effects of a fluopyram seed treatment, ILeVO, on SCN reproduction, sudden death syndrome (SDS) development, and yield in a 3-year field study. Overall, fluopyram had a significant effect on yield ( = 0.046) and end-of-season SCN eggs and second-stage juveniles (Pf, = 0.033) but no significant effect on SCN reproduction (Rf) or SDS disease index ( > 0.05). Post hoc tests indicated that fluopyram increased yield and suppressed SCN quantities. However, Rf was consistently greater than 1 whether or not the seed was treated with fluopyram, indicating that SCN populations were still increasing in the presence of fluopyram. A follow-up greenhouse study indicated that fluopyram reduced SCN relative to nontreated controls, as observed in the field, but only reduced SCN DNA within roots of a susceptible cultivar. These results indicate that fluopyram can suppress SCN quantities relative to nontreated seed but may not successfully reduce nematode populations without the use of additional management strategies.
大豆孢囊线虫（SCN）每年都会对大豆生产造成严重破坏。氟吡菌酰胺是一种常用于大豆种子处理的杀菌剂，旨在控制土壤真菌病原体；然而，最近的研究也表明它对 SCN 具有抑制作用。我们在一项为期 3 年的田间研究中，研究了氟吡菌酰胺种子处理剂 ILeVO 对 SCN 繁殖、猝倒病（SDS）发展和产量的影响。总体而言，氟吡菌酰胺对产量（ = 0.046）和季末 SCN 卵和第二阶段幼虫（Pf， = 0.033）有显著影响，但对 SCN 繁殖（Rf）或 SDS 疾病指数（ > 0.05）没有显著影响。事后检验表明，氟吡菌酰胺增加了产量并抑制了 SCN 的数量。然而，无论种子是否经过氟吡菌酰胺处理，Rf 始终大于 1，这表明在氟吡菌酰胺存在的情况下，SCN 种群仍在增加。随后的温室研究表明，与未处理的对照相比，氟吡菌酰胺在田间观察到的情况下减少了 SCN 的数量，但仅减少了易感品种根系内的 SCN DNA。这些结果表明，氟吡菌酰胺可以抑制 SCN 的数量，而无需额外的管理策略，就可以相对未处理的种子。
