棉隆对番茄根结线虫病的防治效果

设98%棉隆MG 3个不同剂量、10%噻唑膦GR及空白对照共5个处理,进行防治露地番茄根结线虫病的田间药效试验,并从土壤2龄幼虫(J2)减退率和根结防效两方面进行防治效果评价。结果表明,移栽后30 d和60 d,98%MG 450 kg·hm-2处理区的J2减退率分别为91.74%和82.80%,375 kg·hm-2处理区60 d后的减退率达73.81%,表明其不仅对J2数量具有较好的控制作用,同时也具有一定的持效期。收获末期,其3个剂量处理的根结防效均在75%以上,最高达86.14%,对番茄根结形成表现出良好的控制作用,建议使用剂量为375~450 kg·hm-2。基于使用方法和环境因素,应根据实际情况有选择地应用。

Effect of Chemical Dazomet on Controlling of Tomato Root-knot Nematodes

Field experiments were conducted to control tomato root-knot nematode （Meloidogyne incognita） in the field by applying 98% dazomet MG at three rates,300 kg · hm^-2,375 kg · hm^-2 and 450 kg · hm^-2,and the controlling effect was evaluated based on the number of 2nd instar larvae in the soil and the root knot index.The 2nd instar larvae number of the tomato root-knot nematodes was reduced by 91.74% and 82.80% in the soil treated with dazomet at 450 kg · hm^-2 at 30 and 60 days,respectively,and by 73.81% in the soil treated with dazomet at 375 kg · hm^-2 after 60 days,which shows that dazomet has better controlling effect and long persistence.At the end of harvesting,the treatments with dazomet at these three rates had a controlling effect of above 75%,the highest 86.14%,showing the dazomet has a good control of tomato root knots.The application of dazomet into the soil at the rate of 375---450 kg · hm^-2 is recommended.Dazomet should be applied selectively at a given rate based on the application method and environmental factors in line with the field conditions.