Molecular Entomology, 2025, Vol.16, No.1, 19-27 http://emtoscipublisher.com/index.php/me 23 Figure 4 One generation of the Asian corn borer observed in the laboratory Note: A: corn borer eggs; B: second-instar larvae; C: third-instar larvae; D: fifth-instar larvae; E: pupation; F: corn borer pupa; G: before eclosion; H: corn borer moth Instar larvae: body length is about 8.2~13.4 mm, head shell width is about 0.82~1.14 mm. The body color is light pink, the spots on the back are clearly visible, and the movement is more active than instar Ⅰ. Instar larvae: body length is about 13.4~18.6 mm, head shell width is about 1.14~1.46 mm. The body color gradually deepens, from pink to light brown, and the 4 pairs of oval black spots on the back of the body are more obvious. Instar larvae: body length is about 18.6~23.8 mm, head shell width is about 1.46~1.78 mm. Body color is pink-brown, the spots on the back are enlarged and blackened, and the feeding amount increases significantly. Instar larvae: body length is about 23.8~29.0 mm, head shell width is about 1.78~2.10 mm. Body color is light gray or pink-brown, the back spots are relatively lightened, but the spots tend to merge. After entering the mature stage, the body color turns yellow-white, and it stops feeding and prepares to pupate. Figure 5 Asian corn borer larvae Note: A: Ⅰ instar larvae: 3.5 mm; B: Ⅱ instar larvae: 12 mm; C: Ⅲ instar larvae: 18 mm; D: Ⅳ instar larvae: 23 mm; E: Ⅴ instar larvae: 28 mm; F: larval head shell and molting; G: larval head shell width; H: Ⅳ instar larvae and head shell
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