It will take 56 to 63 days for the frist generetion of Asiatic corn borer to develop from egg to larva, pupa, and imago in Dewu region. 7. The primary imperilment period of first gemeration of Asiatic corn borer is shooting stage. And the heading stage, grain filling stage in early sowing corn and belling stage in late sowing cron is disserved by the second generation. The imperilment degree of second generation is more serious than frist generation. 8. The best way for the prevention of black cutworm is to spray on early larva and to trap and kill with poison bait in late larva.

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Prostephanus truncates H. Larger grain borer：大谷蠹

谷象 Sitophilus granarius L. Grain weevil | 大谷蠹 Prostephanus truncates H. Larger grain borer | 菜豆象 Callosobruchus phaseoli

Grain Borer：谷蠹

Grain Beetle 谷盜類(lèi)甲蟲(chóng) | Grain Borer 谷蠹 | Gram Blue 棕灰蝶

Rhyzopertha dominica F. Lesser grain borer：谷蠹

米象 Sitophilus oryzae L. Rice weevil | 谷蠹 Rhyzopertha dominica F. Lesser grain borer | 擬谷盜 Tribolium castaneum H. Red flour beetle