葱斑潜蝇防治指标及防治适期研究

Criteria and advisable time for control of Liriomyza chinensis

研究表明葱斑潜蝇百株潜道 (X)与大葱产量损失率 (Y)之间呈显著的相关性 ,其相关回归式 :Y=-2 .8397+ 0 .0 30 4 8X。在大葱产量 30 0 0～ 6 0 0 0kg 6 6 7m2 时 ,经济允许损失率为 1 .4 7%～ 2 .94 % ,允许百株潜道为 1 4 1 .4～ 1 89.6条 ;防治指标拟定为百株潜道 1 5 0条。防治适期为成虫羽化高峰期至幼虫初孵期 ;大葱生育中、后期 ( 6～ 1 0月 )防治对于降低葱属作物的损失具有较大意义。药剂防治以含有阿维菌素的制剂和乐斯本效果较好。

The relationship between yield loss rate (Y) of the Chinese onion caused by Liriomyza chinesnsis (Kato) and leaf mine number per100 plants (X) were demonstrated. The regression equation was Y=-22.8397+ 0.03048X. When the yield of the Chinese onion was 3*!000～6*!000 kg/667m 2, the economic tolerant loss rate was 1.47% ～2.94% and the tolerant mine number per 100 plants was 141.4～189.6. The control criteria was considered to be 150 mines per 100 plants. The advisable control time was from the peak of adult emergence to the early of larva hatching. The control practice in the middle and late period of onion development time was of significance to reduce loss of the onion yield. The control efficacy of avamectin and chlopyrifod was better that that of other tested insecticides.