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The biplaneted long-planted fluorescent leaf beetle belongs to the order Coleoptera. The family Pycnidae is also known as the double-spotted leaf beetle and the double-circled leaf beetle. It is widely distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Ningxia, Gansu, Xinjiang, Hebei, Shanxi, Shaanxi, Jiangsu, Zhejiang, Hubei, Jiangxi, Fujian, Taiwan, Guangdong, Guangxi, Sichuan, Yunnan and Guizhou provinces (autonomous regions). Since the 21st century, this pest has been more serious in the northern part of China.
Double-spotted long-planted firefly is a multi-food pest, which can harm a variety of crops such as corn, sorghum, millet, cotton, beans, potatoes, white hemp and sunflowers, as well as economic plants such as cruciferous vegetables, beans, carrots, eggplants, licorice, apples, apricots, poplars, willows, etc., and can also parasitize cang-ear, spiny vegetables, red indigo, alfalfa, gray cabbage, purslane horsetang grass, dogtail grass and other weeds, with corn, soybeans and cotton being the most seriously affected. The double-spotted long-planted firefly is mainly used by adult insects to infest corn leaves, male ears and female ears.
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1. Agricultural control
Autumn ploughing and winter irrigation or early spring deep turning, using machinery to kill and bury the overwintering eggs in the soil, can effectively reduce the source base of insects and reduce the harm. In early spring, the eradication of weeds in the fields, ditches and ditches, especially grasses such as barnyard grass and dogtail grasses, can eliminate intermediate host plants, change the habitat environment of double-spotted tarsal fluorescent beetles, and reduce food sources. Tillage measures such as deep soil turning before sowing and idle land on the edge of shallow hoeing can effectively reduce the mouth density of double-spotted long-planted firefly beetles by about 40%. Reasonable fertilization and timely water replenishment can improve the stress resistance and tolerance of plants, and can also reduce losses. In the wheat area, the wheat is sown at the time after harvest, so that the corn development period is advanced, which can alleviate the harm at the seedling stage. Planting enticing crops, such as legumes and calendula of the Asteraceae family, can trap and kill adult double-spotted long-planted fireflies.
2. Biological control
There are relatively few natural enemies of the double-spotted long-planted fluorescent leaf beetle, and biological control is difficult. Midges are one of the natural enemies of the double-spotted long-planted leaf beetle, which can be used to suppress pests by manually collecting adult insects, overwintering indoors, breeding and breeding, and releasing them regularly.
3. Physical control
When the double-spotted long-spotted firefly nail spot occurs, adult insects can be artificially killed in the morning and evening with an insect trap net, or they can be trapped by using black light to reduce the amount of beetles in the field.
4. Chemical control
Due to the low resistance of bimaculata firefly, there are many types of agents that can be used for prevention and control, such as 50% octathion emulsion 1500 times liquid 10% imidacloprid wettable powder 1000 times liquid, 20% cypermethrin emulsion 1500 times liquid, 2.5% high efficiency cypermethrin emulsion 200 times liquid or 4.5% high efficiency cypermethrin emulsion 1000-1500 times liquid spray control, and 25% thiamethoxine water dispersible granules can also be selected, which can effectively control the harm of bi-spotted tarsal firefly nails.
Since the adult insects are mainly fed on the fieldside weeds in the early stage of feathering, the pest resistance in this period is poor, and it is also a critical period for control, and we must pay attention to the spray control of weeds on the edge of the field. In line with the principle of multi-insect treatment, the double-spotted long-planted firefly leaf beetle can also be combined with the armyworm, corn leaf mite and aphid that occur at the same time to take control measures.
Because the adult double-spotted long-planted firefly has the ability to fly, it is necessary to pay attention to the advantages of unified prevention and control, concentrate continuous tablets of medicine, and use drugs 1 to 2 times depending on the occurrence of harmful situations, with an interval of 7d. Spraying time is best to choose before 10:00 and after 17:00, avoid the noon high temperature time, so as to avoid heat stroke, poisoning or drug damage to corn, and these two time periods are the active period of adult double-spotted long-tarsal firefly, which can improve the control effect.
Source: Crop Diseases and Pests in China
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