When the cucumber plant grew into the 4-leaf stage, the EIL of B. tabaci was 9.3159%; the ET of B. tabaci was about 18.4474 adults/plant, or 4.6119 adults/leaf.

 
  • 黄瓜幼苗4叶期时,烟粉虱的经济损害水平为9.;3159%25;烟粉虱的经济阈值为每株黄瓜有烟粉虱成虫18
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