Scientific name Plebejus argus Linnaeus Lepidoptera, Lycaenidae. Alias ​​bean small gray butterfly, silver blue gray butterfly. Distributed in Heilongjiang, Jilin, Liaoning, Hebei, Shandong, Shanxi, Henan, Shaanxi, Gansu, Qinghai, Inner Mongolia, Hunan, Sichuan, and Xinjiang.

Host soybeans, cowpeas, mung beans, sand wang wang, peony, purple cloud peony, yellow peony and so on.

The larvae bite on the lower epidermis and leaves of the leaves, leaving the upper epidermis on the surface, and the individual feeding on the front of the leaves. The leaves are severely eaten, leaving only the petiole and the main veins, and sometimes the stem surface and young horns.

Morphological characteristics Adult body length 9-11mm, wingspan 25-30mm. Male and female. Male fins are cyan in front, with a cyan flare, black rim bandwidth, and white and long bristles; white wings on the front of the forewing, and a black dot on the back wing mixed with the outer rim. The female wings are tan-colored, and the black spots on the front and rear wing sub-peripheries are inlaid with orange crescent moon spots, and the opposite side is grayish white. The front and rear wings have three dark spots. The outer circle is parallel to the middle crescent spot. The middle zone has orange-red ribbons. The spots are circular and irregularly arranged. The second room is one, round and prominent. Moves inwards, corresponding to the upper and middle long side spots in the middle chamber, and the base of the hind wings has 4 other dark spots in a straight line; the black round spot has a white ring at the periphery. Oval flat, 0.5 to 0.8 mm in diameter, yellowish green, and later yellowish white. The larvae are dark brown in color, green in the ankles, dark in the back, yellow on both sides, dark lines on the valves, and white valve lines. The mature larvae are 9 to 13.5mm long. The back has 2 dark spots. The dragonfly is 8-11.2mm long, long-elliptic, yellowish green, grayish black before feathering, no hairs and stripes.

Living habits 5 generations in Henan, with quail in the soil cultivation layer wintering. In late March of the following year, they become adults. From late April to early May, they enter the peak of emergence. Adults lay their eggs on leaves or petioles on sand-dregs and breed in the field for five generations. In late September, mature larvae penetrate into the soil. Wintering. Adults prefer daytime emergence and mating. Mating 10 to 40 minutes, individually up to 1.5 hours. Adults can mate many times, spawn multiple times, eggs prolific on the back of the leaves, scattered production, and some produce on the petiole or tender stems, each producing 1 egg 40-55 seconds, each female eggs 46-121, female Butterfly lifespan was 14.6 days, male 12.4 days, egg period 4.5-6.3 days, larvae 5th instar, only leafy meat was taken before 3rd instar, food intake increased after 3rd instar, and gluttony last entered soil in 2 days. The flood season. Larvae have mutual killing habits and are often symbiotic with ants. After the larvae matured, they climbed near the roots of the plants and headed downwards for 1-2 days in the prepupa period and 7-14 days in the flood period.

Control methods (1) selection of insect-resistant varieties. (2) In the autumn and winter, the plague was severed. (3) In the early stage of larvae hatching, 25% of the chlorfenac 3 suspension agent was sprayed 500-600 times, so that the larvae could not be normal molted or metamorphosis and died. (4) When 100 insects have more than 100 insects, timely spray 20% fenvalerate EC 2000 times or 10% DEP WP 2500 times and 20% IMMO 1500-2000 times.

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