Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011.
Iowa Soybean Association Research-Analytics, Ankeny, IA 50023.
Plant Dis. 2020 Nov;104(11):2914-2920. doi: 10.1094/PDIS-06-19-1132-RE. Epub 2020 Sep 8.
ILeVO (fluopyram) is a fungicide seed treatment for soybean sudden death syndrome (SDS) that also has nematicidal activity. ILeVO is sold with a base of insecticide Poncho (clothianidin), nematode-protectant VOTiVO (), and Acceleron fungicides (metalaxyl, fluxapyroxad, and pyraclostrobin). Yield and reproduction of the soybean cyst nematode (SCN) () on soybean plants grown from seed treated with ILeVO plus the base were compared with those treated with only the base in 27 small-plot experiments and 12 strip-trial experiments across Iowa from 2015 to 2017. To increase the likelihood that yield results were related to effects on SCN, data were used only from 26 small-plot experiments and 12 strip trials in which symptoms of SDS were low or nonexistent. An SCN reproductive factor (RF) was calculated for each experimental unit by dividing the SCN population density at harvest by the population density at planting. ILeVO significantly reduced SCN RF by 50% in one strip-trial experiment and by 36 to 60% in four small-plot experiments but yields were not increased by ILeVO in any of those five experiments. Soybean yields were 2.8 to 3.7 bushels/acre (bu/ac) (188.3 to 248.8 kg/ha) greater with ILeVO in three small-plot experiments but SCN RF was not reduced in those experiments. Also, yield was 1.9 bu/ac (127.8 kg/ha) greater with ILeVO in one strip-trial experiment in 2016 but SCN samples were not collected at harvest from the study to assess the possible effects of ILeVO on SCN reproduction. When strip-trial data from 2015 and 2016 were combined, there was a small but significant 0.8 bu/ac (52.2 kg/ha) yield increase with ILeVO. Overall, the effects of ILeVO on SCN reproduction and soybean yield were variable in these field studies.
ILeVO（氟吡菌酰胺）是一种大豆猝死综合征 (SDS) 的杀菌剂种子处理剂，也具有杀线虫活性。ILeVO 与杀虫剂 Poncho（噻虫啉）、线虫保护剂 VOTiVO（）和 Acceleron 杀菌剂（精甲霜灵、氟环唑和吡唑醚菌酯）一起销售。2015 年至 2017 年，在爱荷华州的 27 个小区试验和 12 个条播试验中，比较了用 ILeVO 加基础处理的种子种植的大豆植株上的大豆胞囊线虫（SCN）()的产量和繁殖情况与仅用基础处理的情况。为了增加产量结果与 SCN 影响相关的可能性，仅使用了来自 26 个小区试验和 12 个条播试验的数据，这些试验中 SDS 症状较低或不存在。通过将收获时的 SCN 种群密度除以种植时的种群密度，为每个试验单元计算 SCN 繁殖因子 (RF)。在一个条播试验中，ILeVO 将 SCN RF 显著降低了 50%，在四个小区试验中降低了 36%至 60%，但在这五个试验中，ILeVO 都没有增加大豆产量。在三个小区试验中，使用 ILeVO 可使大豆产量增加 2.8 至 3.7 蒲式耳/英亩 (bu/ac)（188.3 至 248.8 公斤/公顷），但在这些试验中，SCN RF 并未降低。此外，在 2016 年的一个条播试验中，使用 ILeVO 可使产量增加 1.9 蒲式耳/英亩 (bu/ac)（127.8 公斤/公顷），但在研究中未在收获时采集 SCN 样本以评估 ILeVO 对 SCN 繁殖的可能影响。当合并 2015 年和 2016 年的条播数据时，使用 ILeVO 可使产量略有但显著增加 0.8 蒲式耳/英亩 (bu/ac)（52.2 公斤/公顷）。总体而言，在这些田间研究中，ILeVO 对 SCN 繁殖和大豆产量的影响是可变的。
