植物生长调节剂与杀菌剂互作对棉苗病害的作用机理

Study on the combination effect of plant growth regulator and fungicide on cotton Fusarium spp.

以棉花红腐病为研究对象,将室内毒力测定与温室盆栽试验相结合,研究了植物生长调节剂氯化胆碱与6种杀菌剂的互作效果。生长速率法测定了6种杀菌剂对棉花红腐菌的毒力:福美双、甲基立枯磷、丙环唑、烯唑醇、多菌灵、三唑酮对棉花红腐菌的EC50分别是7.47、5.59、0.37、0.64、0.57、6.92mg·kg-1。通过温室盆栽实验,分别测定了氯化胆碱与6种杀菌剂混用拌种对棉苗红腐病的影响,结果表明:氯化胆碱+福美双、氯化胆碱+甲基立枯磷、氯化胆碱+丙环唑对棉苗红腐病的防效分别为66.17％、74.74％和68.02％,对棉花红腐病有增效作用;氯化胆碱+烯唑醇、氯化胆碱+多菌灵、氯化胆碱+三唑酮对棉苗红腐病有相加作用。氯化胆碱对棉花芽长、根长有促进作用。

This study was focused on the combination effect of plant regulator and fungicide on cotton Fusarium spp.. By the method of growth ratio in PDA culture media, the EC50 on Fusarium spp. of 6 fungicides, such as thiram, carbendazim, triadimefon, propiconazol, tolclofos-methyl, and diniconazole were measured, the results were: 7.47, 0.57, 6.92, 0.37, 5.59, 0. 64(mg·kg-1). In the pot experiments, the interactions of choline chloride + propiconazol, choline chloride+tolclofos+methyl, choline chloride + thiram displayed synergism to the rot of cotton seedling, while the interactions of choline chloride + triadimefon, choline chloride +carbendazim, choline chloride+diniconazole showed additive effect. Choline chloride could promote the growth of cotton, which were demonstrated by the buds length and root length.