But the maximum occurrence of H. assulta, H. armigera and S. litura was in the mid-August, the average density was 3.9 and 3.0 per plant, respectively.

　
英 美
  • 斜紋夜蛾、煙青蟲(chóng)和棉鈴蟲(chóng)幼蟲(chóng)的發(fā)生高峰期均在8月中旬，平均每株蟲(chóng)量3.；9頭、斜紋夜蛾3
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