Canola eight gray moth

The scientific name Creatonotus transiens (Walker) belongs to the order Lepidoptera. Distributed in Shanxi, Shaanxi, East China, Central China, South China, Taiwan, Inner Mongolia, Fujian, Guangxi, Sichuan, Yunnan, Tibet and other provinces.

Hosts canola, cabbage, cabbage, cabbage and other cruciferous vegetables and citrus, mulberry, tea, rice leaves.

The traits are characterized by larvae feeding on nicks or holes, affecting yield and quality.

Morphological characteristics Adult body length 20mm, wingspan 38-54mm. The head is white and slightly brownish. The lower lip must be 3 knots, the frontal border and tentacles black; the chest full with a black band and the upper leg orange. The back of the abdomen is orange, with abdomen at the end of abdomen and abdomen white, and black spots on the back, sides, and sides of abdomen sections. The forewings are greyish white with a slight pink color. In addition to the leading edge area, the veins are brownish. The upper and lower corners of the middle chamber have two black spots, one of which is not obvious. The hind wings are also gray and white, sometimes with several black sub-points. Male wings are grayish-brown in color, yellowish on the leading edge, dark spots in the middle room, and dark wings. Egg yellow, spherical, slightly flat bottom. Larvae body length 35-43mm, black brown head, with white spots, body black, hair clusters reddish brown, back with white broadband, lateral hairy khaki, clustered black hairy. 22mm long, earthy to red, with engraved dots on the abdomen. Bare, gray.

Life habits 2-3 years old, larvae overwintering, beginning in March next year, mid-May adult emergence, about 70 days per generation, egg period of about 8-13 days, larval period of 16-25 days, flood season 7 - 16 days. In May, larvae in Guangdong started to infest. From October to November, they entered the peak period. Adults were active at night. They laid eggs on the back of the leaves or near the veins. They had several eggs or dozens of eggs together. Each female could produce 140 eggs and the larvae hatched. Feeding on the back of the leaves, the last-instar larvae mostly crawl on the ground and spine sticky leaf knots, phlegm and phlegm, and some do not spit under the litter.

Control methods (1) Agricultural control Plowing land can eliminate part of the overwintering larvae in the topsoil or dead leaves and reduce the source of insects. (2) Grab 25% diflubenzuron 3x Suspension 500 to 600 times or 20% fenvalerate EC 3000 times, and 2.5% kung-fu 2000 times , 20% chlorinated EC or 2.5% Uranus EC 3000 times, 20% EC 2000 times better.



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