Corn borer Pyrausta nubilalis ( Hubern ), also known as the corn borer, adult male moths yellow-brown, body length of 10 to 13 mm, the wing exhibition 20 - 30 mm, back in brown, the last abdominal thin tentacles filiform, apex, grayish brown, brown forewings, with two brown wavy stripes, two lines have two Tan short grain brown, hind wing; females and male moths similar morphology, color is shallow, fresh yellow forewings, linear light brown, yellowish brown back, abdomen is obesity. Egg, flattened oval, the number of grains to dozens of grain composition of egg masses, a fish squamous arrangement, for the beginning of milky white, gradient is yellowish-white, before hatching eggs as part of a dark brown ( as head of larvae, called the black period). Mature larvae, body length of about 25 mm, cylindrical, black brown, back color light brown, dark brown, grayish yellow etc, in the back of the hairy chest, abdominal aneurysm 4, section 1~8 back has two rows of gross tumor before and after each of the two. Pupa, 15~18 mm long, yellowish brown, long fusiform, trailing bristle 5~8 root.
Corn borer is a major pest of maize, mainly distributed in Beijing, northeast, Hebei, Henan, Sichuan, Guangxi, spring, summer, autumn sowing corn have different levels of victimization, especially in summer sowing maize is the most important, can endanger the corn plant on various parts of the body, make the victims of partial loss of function, reduced grain yield.
Recommended prevention methods: each 667m2 with 10000000000 /ml Empedobacter brevis spore suspension agent from 80 to 100 45 kg water in maize leaves, buds and other parts of spray mist.
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