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FS>25%氰烯菌酯SC>25%咪鲜胺EC>20%氰烯菌酯?杀螟丹WP>25g/L咯菌腈FS>16%咪鲜胺?杀螟丹WP>62.5g/L精甲霜灵?咯菌腈FS>22%氟唑菌苯胺FS>12%甲?嘧?甲霜灵FS>17%多菌灵?福美双FS>17%杀螟丹?乙蒜素WP>15%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FS>25%氰烯菌酯SC>20%氰烯菌酯?杀螟丹WP>17%杀螟丹?乙蒜素WP>62.5g/L精甲霜灵?咯菌腈FS>12%甲?嘧?甲霜灵FS>0.25%戊唑醇FS>25%咪鲜胺EC>16%咪鲜胺?杀螟丹WP>25 g/L咯菌腈FS>17%多菌灵?福美双FS>15%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.