Scientific name: Artogeia (Pieris) melete (Menetries) Lepidoptera, Pieridae. Alias ​​black butterfly. Distributed in Heilongjiang, Liaoning, Henan, Shaanxi, Fujian, Jiangxi, Hubei, Guangxi, Yunnan, Qinghai, Tibet and other provinces.
Host rape, cabbage, cabbage, yellow bud white, mustard, radish cultivation and wild cruciferous plants.
The traits of the larvae cause the leaves to become nicks or holes. When the larvae die out, they eat up all the leaves, leaving only the veins and petioles, and the feces contaminated the heart.
Morphological characteristics Adult body length of about 16mm, wings 46-56mm, similar to the cabbage butterfly. Male butterfly wings white, veins black. The black veins of the fore-wing veins, apical and posterior edges are black, and the two dark spots near the outer edge are larger, and the one dark spot below is connected with the black band at the posterior edge; the black spots are located at the front of the hind wings. One. On the back of the wing, there is a yellow scale powder on the top wing and back wing of the wing, and one orange-yellow spot on the base of the back wing. The base of the female butterfly wing is light dark brown, and the stain and the rear end of the butterfly are thick. Others are the same as males. This kind of spring and summer type. Spring-type individuals are slightly younger, with slightly elongated wings and darker shades of black; summer-type bodies are larger, and their body color is slightly lighter and more pronounced. Egg-shaped, long lmm. The larvae are similar to the larvae of the Pieris rapae. There is only a ring of yellow spots on the valve line that surrounds the valve.蛹 Spindle shape, slightly pointed at both ends.
Living habits are 4-5 years old in Northeast and North China, 7-8 in East China, 8-9th in South China and Southwest China. They live in the fences, house walls, trunks, etc. near the vegetable gardens. They become adults in March-April of the following year. November is the larvae damage period. Adults fly during the day, take nectar, and inhabit plants on nights. There are more natural enemies, such as pink butterfly wasp, which has a certain effect on the number of insects.
Prevention methods (1) After the harvest, clean the pastoral areas, eliminate fleas and larvae to reduce the source of insects. (2) Reasonable layout and timely sowing. (3) 7-8 days after the adult spawning peak, the 3rd instar larvae reach 50%, and the temperature is above 20°C. t emulsion, 8401, 8010 and other 600-800 times liquid spray; can also use 25% Diflubenzuron No. 3 suspension 500 times the liquid, in the egg hatching peak medication, so that the larvae can not normal molting, metamorphosis and death. The best choice for the use of Bacillus thuringiensis preparations is low-volume sprays, in addition to the use of low-dose chemical pesticides such as marathon, cypermethrin, deltamethrin, and cypermethrin. For example, the addition of 10% cypermethrin 3000 to 4000 times to Synechococcus spp. in liquid No. 6 has a synergistic effect on Pieris rapae, Plutella xylostella, Aphis gossypii, Brassica oleracea, Brassica napus and so on. (4) Promote the use of oxymatrine 500-800 times. (5) Spray 90% Methomyl WP 2000 times or 5% Sodium Tetrachloride 8000 times, 20% fenvalerate 2000-2500 times, 2.5% Deltamethrin 2000 times , 2.5% Kumquat Chrysanthemum Emulsion 2000 times, 2.5% Uranus Emulsion 3000 - 4000 times, 5% Regent suspension 50 - l00 ml per 667m2.
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