3种种衣剂对小麦纹枯病的室内毒力和田间防效

目的]筛选小麦纹枯病的安全高效田间种衣剂。方法]采用室内毒力测定和田间试验相结合的方法研究60 g/L戊唑醇悬浮种衣剂(FS)、30 g/L苯醚甲环唑FS、25 g/L咯菌腈FS 3种种衣剂对小麦纹枯病的室内毒力和田间防治效果。结果]室内毒力测定结果表明,戊唑醇、咯菌腈对小麦纹枯病病原菌均有较好的抑制作用,苯醚甲环唑的效果较差,其EC50分别为0.006 0、0.108 7、5.113 2 mg/L;田间试验结果表明,60 g/L戊唑醇FS、30 g/L苯醚甲环唑FS、25 g/L咯菌腈FS的田间防效相差不大,在50%~65%;3种种衣剂处理后小麦产量与对照相比均有一定提高,其中戊唑醇对小麦增产效果最好,最高增产11.01%。结论]3种种衣剂均可作为小麦纹枯病防治药剂大范围使用。

Toxicity and Field Control Effects of Three Seed Coatings against Wheat Sharp Eyespot

Objective] The aim was to screen out efficient and safe seed coatings against wheat sharp eyespot . Method] The indoor toxicity and field protection effect of three fungicides 60 g/L suspension concentrate for seed dressing ( FS) of Tebuconazole, 30 g/L FS of Difenocon-azole and 25 g/L FS of Fludioxonil were tested against wheat sharp eyespot. Result] The indoor toxicity result displayed that Tebuconazole and Fludioxonil exhibited strong inhibitory activities while Difenoconazole had poor effect against wheat sharp eyespot, and the EC50 values were 0.006 0, 0.108 7 and 5.113 2 mg/L separately.Tebuconazole showed the best fungistatic effect.The three fungicides all showed no sig-nificant control effect, and the values were 50% to 65% from the field test results.Compared with the control, the wheat yield was increased treated with three seed coatings.The wheat treated with Tebuconazole showed the most yields increased, maximum yield increased by 11.01%.Conclusion] The three seed coatings were recommended for wheat production against wheat sharp eyespot.