摘要
为探明氯啶菌酯与氟啶胺混剂对稻瘟病菌的联合毒力及田间防效,开发防治稻瘟病的新药剂,采用菌丝生长速率法分别检测氯啶菌酯、氟啶胺及其7种配比混剂对稻瘟病菌的毒力,并进行最佳配比制剂的田间药效试验。结果表明,氯啶菌酯、氟啶胺及其配比为4:1、3:1、2:1、1:1、1:2、1:3和1:4的混剂对稻瘟病菌菌丝生长抑制的EC50分别为1.4417、0.5445、0.2313、0.2693、0.1695、0.4151、0.2796、0.3395和0.3428μg/mL,7种混剂的增效系数分别为4.69、3.79、5.49、1.90、2.46、1.90和1.81,氯啶菌酯与氟啶胺配比为2:1增效作用最显著。田间药效试验中,各处理对稻穗瘟防效由高到低依次为30%氯啶菌酯·氟啶胺SC 600 mL/hm2、30%氯啶菌酯·氟啶胺SC 450 mL/hm2、30%氯啶菌酯SC 450 mL/hm2、75%三环唑WP 300 g/hm2、30%氯啶菌酯·氟啶胺SC 300 mL/hm2、40%稻瘟灵EC 1200 g/hm2、30%氟啶胺SC 450 mL/hm2,防效分别为88.39%、83.40%、80.22%、72.91%、71.28%、65.09%和60.79%,并且均对水稻生长安全。30%氯啶菌酯·氟啶胺SC 600 mL/hm2对稻瘟病防效优良,对水稻生长安全,可开发为稻瘟病防治药剂。
To explore a new reagent for controlling rice blast,the co-toxicity and field control efficacy of mixtures of pyrisoxazole and fluazinam on Magnaporthe grisea in rice were measured.The indoor toxicity of pyrisoxazole,fluazinam and their seven mixtures on M.grisea in rice was detected by using mycelium growth rate method,and the field control tests of the optimum formulation to rice panicle blast was conducted.The results of indoor toxicity tests showed that the EC50 values of pyrisoxazole,fluazinam and their seven mixtures at the ratio of 4:1,3:1,2:1,1:1,1:2,1:3,and 1:4 on M.grisea were 1.4417,0.5445,0.2313,0.2693,0.1695,0.4151,0.2796,0.3395 and 0.3428μg/mL,respectively,and the synergistic coefficients were 4.69,3.79,5.49,1.90,2.46,1.90,and 1.81,respectively.The mixture at the ratio of 2:1 had the highest synergism.The results of the field control efficacy showed that the control efficacy was in the following order:30%pyrisoxazole·fluazinam SC 600 mL/hm2>30%pyrisoxazole·fluazinam SC 450 mL/hm2>30%pyrisoxazole SC450 mL/hm2>75%tricyclazole WP 300 g/hm2>30%pyrisoxazole·fluazinam SC 300 mL/hm2>40%isoprothiolane EC 1200 mL/hm2>30%fluazinam SC 450 mL/hm2,and their field control efficacy were 88.39%,83.40%,80.22%,72.91%,71.28%,65.09%,and 60.79%,respectively,and all treatments were safe for rice growth.30%pyrisoxazole·fluazinam SC 600 mL/hm2 has excellent control efficacy on rice blast and is safe for rice growth,which can be developed as a rice blast control agent.
作者
陈宏州
张建华
杨红福
周华飞
缪康
束兆林
姚克兵
Chen Hongzhou;Zhang Jianhua;Yang Hongfu;Zhou Huafei;Miao Kang;Shu Zhaolin;Yao Kebing(Zheryiang Institute of Agricultural Sciences in Hilly Area of Jiangsu Province,J urong Jiangsu 212400)
出处
《中国农学通报》
2020年第28期124-130,共7页
Chinese Agricultural Science Bulletin
基金
江苏省农业科技自主创新资金项目“水稻重要病虫害绿色防控技术研发与应用”[CX(18)1003]。
