[Distribution] Damaged kidney beans, kidney beans, lentils, green beans, peas, broad beans, soybeans (edamame), etc. The distribution ranges from Jilin and Inner Mongolia in the north to Taiwan, Guangdong, Guangxi, Yunnan and Shandong in the south.
[Hazardous symptoms] The larvae damage the bean leaves, flowers, and bean pods, and often damage the leaflets and feed them into the young seeds of the larvae. The feces are accumulated inside the pods and outside the pod boreholes. The affected pods are bitter and unbearable. In severely affected areas, the rate of defamation exceeded 70%.
ã€Pest morphology】 belongs to Lepidoptera, Pyralidae. The adult body is about 13 mm long and has a wingspan of 24-26 mm. It is dark brown in color. There are 2 white transparent spots in the center of the fore wings; white translucent hind wings and dark brown wavy lines on the inside. Egg 0.60.4 mm, flat, oval, pale green, hexagonal reticular surface. The mature larvae are about 18 mm in length, yellow-green, and brown on the head and the pronotum. On the middle and rear thoracodorsal plates, there are six dark brown hairs, four in the forefront, each with two bristles, and two bristles at the rear; the back of the abdomen has six hairs of the same hair, but each has only one bristles. The dragonfly is 13 mm long, yellow-brown. The top of the head is prominent, compound eye is red-brown. Before the feathering, transparent spots of the adults' forewings can be seen on the brown wing buds.
Occurrence regularity occurs in the North China region from 3 to 4 generations, from 4 to 5 generations in Central China, and 7 generations in South China. Every year from June to October is the larvae damage period. Adults have phototaxis, eggs scattered in tender pods, buds and petioles, egg period 2 to 3 days. A total of 5 larvae were larvae. The newly hatched larvae invaded the tender larvae or flower buds to feed on the larvae, resulting in the loss of buds and pods. After the third instar, the larvae were eaten into the pods, and 1 larvae per locust, a few 2-3 larvae, were killed in the rain. Often causes rot. Larvae are also often damaged by spinning leaves. Larvae 8 to 10 days. Old mature larvae do phlegm and shoot on both sides of the main vein of the back of the leaf, and they can also be used to make the larvae on the surface of fallen soil or in the fallen leaves. Flea period 4 to 10 days. The cowpea meal has a wide range of temperature adaptation and can develop at 7°C to 31°C, but the optimum temperature is 28°C and the relative humidity is 80% to 85%.
ã€Prevention and Control Methods】 (1) Remove the flowers in the field and fall out of time, and remove the wounded leaves and pods to reduce the source of insects. (2) Black light is set in the bean field to trap and kill adult insects. (3) Chemical control: use 20% triazophos EC 700 times, 40% exterminator EC 30 ml per mu, water 50-60 kg, and 5% Ruijin special suspension 2500 times, starting from bud Spraying buds and flowers once every 10 days can control the damage. If you need to cure other pests, you should spray them thoroughly.
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