不同目数防虫网覆盖对不结球白菜生长及防虫效果的影响

以不结球白菜品种上海鸡毛菜为试材，采用20、40、60目3种不同目数防虫网覆盖栽培．研究不同目数防虫网对不结球白菜生长及防虫效果的影响。试验结果表明，与露地栽培相比。不同目数防虫网覆盖对虫害阻隔效果明显，其中40、60目防虫网防虫效果较好，对小菜蛾、菜青虫、黄曲条跳甲、菜蚜和烟粉虱的防治效果均达90％以上：从生长情况来看，覆盖60目防虫网上海鸡毛菜生长速度最快，覆盖40目防虫网产量最高，达1033．8kg／667m2。

Effects of Covering with Insect Proof Net on Growth and Anti-insect Efficiency of Brassica campestris ssp. chinensis Makino

Taking non-heading Chinese cabbage cuhivar Shanghai Chinese little greens as test material, we studied the effects of covering with 20, 40 and 60 mesh insect proof nets on the growth and anti-insect efficiency of Brassica campestris ssp. chinensis Makino. The results showed that, compared with the open field cultivation, covering insect net could separate insects from Chinese little greens, and 40 and 60 mesh insect proof nets had higher anti-insect efficiency, with the control efficiency against Plutella xylostella, Pieris rapae sp., Phyllotreta striolata, Brevicoryne brassicae and Bemisia tabaci over 90%. In conclusion, covering with 60 mesh insect proof net, Shanghai Chinese little greens grew fastest, while covered by 40 mesh insect proof net, the yield of Chinese little greens was highest, and the yield was 1 033.8 kg/667 m2.