The scientific name Matsumuraeses phaseoli (Matsumura) belongs to the order Lepidoptera. Distributed in the Northeast, Northwest, East China, Taiwan and other provinces.
Host soybeans, peas, mung beans, adzuki beans, alfalfa, grass rakes and so on.
Characteristics of larvae Damaged larvae damage leaves, flower clusters, and grazing granulocytes. Newly hatched larvae are harmed by tender buds or hairs. After the 2nd instar, silkworms form a group of leaf margins, apical shoots, and pods, and larvae therein. Feeding, causing dry top.
Morphological characteristics Adult body length 6-7mm, wingspan 14-23mm. Male and female heterosexuality, polymorphism in the same sex. The female moth has brown wings, and the markings are not obvious. The front edge near the top corner is gray and white, and the outer edge of the apex is depressed; the male moth has a brownish forehead, and the base spot is brown. There is a brown spot on the outside of the middle side, with a large brown spot and base spot above it. Connected intermittently, the front edge has 18-20 white hook lines. There are 3 small black spots in the upper part of the hip angle, which are arranged in a straight line. There are also 2 small black spots near the top corner. Slightly concave in front of the rim, with grey hind wings. The eggs are oval or round in shape, with a central bulge, a reticulate appearance, and a length of about 0.65mm. They are yellowish-white in color and turn brownish before hatching. The last instar larvae were 11-14mm in length, pale yellow in color, brown in the head, black wedge patterns on both sides, bipedal full rings of ventral toe hooks, and double-sequence loops in the hip toe hooks. The end of the 10th abdominal segment has dark brown buttocks and has 5-8 teeth. The dragonfly is 7-9mm long, yellowish-brown, with 2 rows of teeth on the back of the 2-7th section of the abdomen, and 8 hooks at the end of the abdomen.
Living habits Shaanxi is born 4 to 5 generations, the fourth or fifth generation of the last instar larvae or cockroaches wintering in the bean field, the adult overwintering in early April of the following year. From April to May, the eggs were laid on the back of 90% of leguminous plants such as sorghum and grass trees, and the first generation of adults emerged in late May and early June. The larvae hatched and attacked spring soybeans after hatching. From mid-July to mid-August, the second and third generations of adult worms emerged from early September to early October. The larvae attacked summer sowing soybeans. From mid-October to November, the fourth generation of adults emerged, and they lay their eggs on autumn sowing beans, cockroaches and grass storks. The first adult of this insect in Shandong Province was prosperous in late July, the second generation of early August, the third generation of August to early September, and the fourth-generation instar larvae were overwintering from late September to mid-October. Adults lie lurking under the bean plants, and have phototaxis. The seedling period really leaves the eggs. The adult plants are mostly in the lower part of the leaves and velvet. The newly hatched larvae climb to the upper buds to feed on them. They are inactive before the 2nd instar and after 3rd instar. Frightened more quickly back. Rainy years are heavy and summer droughts are lighter.
Control methods (1) selection of insect-resistant varieties. Generally hairy or limited breeds have insect tolerance or insect resistance. (2) Use black light to trap adult insects. (3) Early spraying of 10% imidacloprid wettable powder l 500 times or 2.5% kappa butter 2000 times, 40% fenvalerate 2000 times, 2.5% deltamethrin 2000 times , every 10 days, can control the damage, if you need to cure other pests, it should be a comprehensive spray. The drug was stopped 7 days before harvest.
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