四种杀菌剂防治玉米茎腐病的田间药效及产量效应研究

Effects on corn stalk rot field control and yield of four fungicides

为了筛选出高效防治玉米茎腐病的杀菌剂,选用6%戊唑醇悬浮种衣剂、350 g/L精甲霜灵种子处理乳剂、25 g/L咯菌腈悬浮种衣剂、10%嘧菌酯悬浮种衣剂4种杀菌剂,采用拌种法进行防治玉米茎腐病的田间药效试验,并进行了产量比较。结果表明,4种杀菌剂在2个不同剂量下对玉米茎腐病都有明显的防治效果,但同一药剂不同剂量之间差异极显著。在推荐的高剂量下,4种杀菌剂对玉米茎腐病的防治效果均在80%以上,其中,10%嘧菌酯悬浮种衣剂防治效果最高。10%嘧菌酯悬浮种衣剂以200 mL/100 kg种子处理的产量显著高于其他处理,达14086.67 kg/hm^(2)。在生产中建议根据戊唑醇、精甲霜灵、咯菌腈和嘧菌酯等药剂的推荐用药量,以嘧菌酯为主体,与其他3种药剂进行轮换、复配使用。

To screen effective fungicides to control the corn stalk rot,four fungicides were selected:6%tebuconazole suspension seed coating agent,350 g/L metalaxyl-M seed treatment emulsion,25 g/L fludioxonil suspension seed coating agent and 10%azoxystrobin suspension seed coating agent.The field efficacy test of corn stem rot control was carried out by seed dressing method,and the yield was compared.The results showed that the four fungicides had apparent control effect at 2 doses,with extremely differences in differ⁃ent dose as the same fungicide.At the recommended high dose,the control effects of the four fungicides on corn stem rot were more than 80%,of which 10%azoxystrobin suspension seed coating had the highest control effect.The yield of 10%azoxystrobin suspension seed coating agent treated with 200 mL/100 kg seed was significantly higher than that of other treatments,reaching 14086.67 kg/hm2.In the production,it was suggested to rotate and mix pyrimethanil with the other three agents according to the recommended dosage of tebuconazole,metalaxyl-M,fludioxonil and azoxystrobin,taking the azoxystrobin as the main body,alternated or mixed with the oth⁃er 3 fungicides.