水稻恶苗病防治药剂效果评价

为探明水稻恶苗病药剂防治现状,采用菌丝生长速率法分别检测了12种原药及12种制剂对多菌灵和咪鲜胺双重抗性藤仓镰孢菌(Fusarium fujikuroi)的室内毒力,并分别于2016和2017年进行了12种制剂的田间药效试验。室内毒力检测结果表明:12种原药抑菌活性强弱依次为戊唑醇氰烯菌酯咪鲜胺咯菌腈多菌灵甲基硫菌灵乙蒜素嘧菌酯噁霉灵福美双精甲霜灵甲霜灵;12种制剂抑菌活性强弱依次为0.25%戊唑醇FS25%氰烯菌酯SC25%咪鲜胺EC20%氰烯菌酯·杀螟丹WP25 g/L咯菌腈FS16%咪鲜胺·杀螟丹WP62.5 g/L精甲霜灵·咯菌腈FS22%氟唑菌苯胺FS12%甲·嘧·甲霜灵FS17%多菌灵·福美双FS17%杀螟丹·乙蒜素WP15%噁霉灵WP。2年田间试验结果表明:12种制剂推荐剂量下对水稻恶苗病防效高低依次为22%氟唑菌苯胺FS25%氰烯菌酯SC20%氰烯菌酯·杀螟丹WP17%杀螟丹·乙蒜素WP62.5 g/L精甲霜灵·咯菌腈FS12%甲·嘧·甲霜灵FS0.25%戊唑醇FS25%咪鲜胺EC16%咪鲜胺·杀螟丹WP25 g/L咯菌腈FS17%多菌灵·福美双FS15%恶霉灵WP。22%氟唑菌苯胺FS、25%氰烯菌酯SC、20%氰烯菌酯·杀螟丹WP等3种制剂在水稻恶苗病防治及抗性治理中具备更为优良的应用前景。本研究为水稻恶苗病防治提供了科学依据。

Efficacy Evaluation of Fungicides for Rice Bakanae Disease

To investigate fungicide control of rice bakanae disease (RBD), the indoor toxicity of 12 fungicides TC and 12 fungicide formulations toFusarium fujikuroi with double-resistance to carbendazim and prochloraz were detected by mycelium growth rate method, respectively, and the field control tests were conducted in 2016 and 2017. The indoor toxicity tests showed that the inhibiting activity of 12 fungicides TC to mycelium growth was tebuconazole > phenamacril > prochloraz > fludioxonil > carbendazim > thiophanate-methyl > ethylicin > azoxystrobin > hymexazol > thiram > metalaxyl-M > metalaxyl, and the inhibiting activity of 12 fungicide formulations was 0.25% tebuconazole > 25% phenamacril > 25% prochloraz > 20% phenamacril?cartap WP > 25 g/L fludioxonil FS > 16% prochloraz?cartap WP > 62.5 g/L metalaxyl-M?fludioxonil FS > 22% penflufen FS > 12% thiophanate-methyl?azoxystrobin?metalaxyl FS > 17% carbendazim?thiram FS > 17% cartap?ethylicin WP > 15% hymexazol WP. Field trials in 2016 and 2017 showed that the field control effect of recommended doses of the 12 fungicide formulations against RBD was in the order of 22% penflufen FS > 25% phenamacril SC > 20% phenamacril ? cartap WP > 17% cartap ? ethylicin WP > 62.5 g/L metalaxyl-M?fludioxonil FS > 12% thiophanate-methyl?azoxystrobin?metalaxyl FS > 0.25% tebuconazole FS > 25% prochloraz EC > 16% prochloraz?cartap WP > 25 g/L fludioxonil FS > 17% carbendazim?thiram FS > 15% hymexazol WP. In conclusion, 22% penflufen FS, 25% phenamacril SC and 20% phenamacril? cartap WP have excellent application prospect in RBD control and resistance management.