生物熏蒸对南方根结线虫存活的室内测定

Effect of Biofumigation on the Survival of Meloidogyne incongnita in a Laboratory Condition

在室内条件下测试了球茎甘蓝、甘蓝、大白菜、小白菜、芥兰、油菜和菠菜对南方根结线虫的生物熏蒸效果。结果表明,7种蔬菜对南方根结线虫均有一定防效,其中球茎甘蓝的熏蒸效果最好,在处理15 d后线虫的死亡率为92.1%,而菠菜的熏蒸效果最差,仅为51.9%。在35°C条件下球茎甘蓝处理9 d后,线虫的死亡率达到100%,其熏蒸效果显著高于20°C和30°C处理。25 g球茎甘蓝碎段与200 g土壤混合后15 d、30 g球茎甘蓝与200 g土壤中混合后12d可杀死100%的线虫,30 g甘蓝与200 g土壤混合后熏蒸15 d也能达到100%的防效,各种蔬菜的对线虫的防效均随着熏蒸时间的延长、剂量的增加而升高。

Effect of biofumifgation using Brassica oleracea L. var. caulorapa, B. oleracea var. capitata, B. campestris pekinensis , B . chinensis , B . alboglabra , B. campestris and Spinacia oleracea on the survival of Meloidogyne incongnita were evaluated in the laboratory condition. The results showed that all the seven vegetable can cause the death of the nematodes, in which B. oleracea L. var. caulorapa, have the highest fumigation effect. The mortality of the nema- tode after 15 d in the treatment of 20 g B. oleracea var caulorapa mixed with 200 g soil was 92.1% while it was 51.9% in the S. oleracea treatment.The mortality of nematodes was 100% in the treatment of Brassica oleracea var caulorapa at 35 ℃ after 9 d. it was higher than that at 20 ℃ and 30 ℃. 100 % nematodes were killed in the treatments of 25 g Brassica oleracea var caulorapa mixed with 200 g soil after 15 d and of 30 g Brassica oleracea var caulorapa mixed with 200 g soil afetr 12 d.The same resulte were got when 30 g B. oleracea var. capitata mixed with 200 g soil afetr 15 d.The con- trol efficiency increased with incresed dosage of vegetable used and exposed time.