4种杀菌剂防治草坪草夏季斑枯病研究

Control effect of four kinds of fungicide on summer patch of turfgrass

夏季斑枯病是危害冷季型草坪草的主要病害之一,严重影响草坪质量,目前我国仍未有登记药剂防治夏季斑枯病。本研究结合室内毒力测定及田间防效检验,分析比较了嘧菌酯、稻瘟灵、丙环唑和甲基硫菌灵4种杀菌剂对夏季斑枯病菌的抑制效果,评估了药剂的田间防病效果。结果表明,丙环唑对供试的夏季斑枯病菌3株靶标菌抑制效果最佳,EC50为0.09~0.16μg/mL;嘧菌酯次之,EC50为0.14~0.28μg/mL;稻瘟灵和甲基硫菌灵抑制效果再次之。4种杀菌剂对夏季斑枯病害均具有较好的防控效果;其中50%嘧菌酯水分散粒剂制剂用量800 g/hm^2防控效果最佳,第4次药后17 d可达99.09%;25%丙环唑乳油制剂用量2000 g/hm^2防控效果次之,第4次药后17 d为93.14%。

Summer patch,caused by Magnaporthe poae,is one of the main root diseases of cool-season turfgrasses,and usually results in great destructibility.However,there are still no alternative registered fungicides against the disease in China.In this study,indoor toxicities of azoxystrobin,isoprothiolane,propiconazole and thiophanate-methyl were evaluated and field control effects were investigated.The results showed that propiconazole had the best inhibitory effect on three target fungi,with the EC50 values of 0.09-0.16μg/mL,followed by azoxystrobin,with the EC50 values of 0.14-0.28μg/mL.Field trials indicated that all tested fungicides had good control effect,azoxystrobin 50%WG 800 g/hm^2(dosage of preparation)was best,with the efficacy of 99.09%after fourth application,followed by propiconazole 25%EC 2000 g/hm^2(dosage of preparation)with the efficacy of 93.14%after fourth application.