Meadow borer, also known as yellow-green striped borer, beet reticulated borer, belongs to the order Phosphorus finnidae, moth family. The meadow borer is a world pest. Mainly distributed in Europe, North America and the Asian continent, China's proximity to Russia and neighboring countries are also seriously harmed. In China, it is mainly distributed in the northeast, north China and northwest regions, including Inner Mongolia, Heilongjiang, Jilin, Liaoning, Hebei, Shanxi, Beijing, Shaanxi, Ningxia, Qinghai and other northern provinces (districts and cities). Occurrence and distribution of grassland borer in China The morphological characteristics of adult grassland borer are small light gray-brown moths. The forewings are greyish brown with small yellowish dots on the outer edge in a line, and a distinct pale yellow diamond-shaped spot in the center of the wing chamber. There is a small triangular pale yellow spot on the medial anterior margin of the apical angle. At rest, the wings are stacked into a triangle, the compound eyes are blue-green, and the antennae are whiplash-like. The end of the abdomen of the female moth is slightly blunt and rounded, and the end of the abdomen of the male moth is slightly pointed. Grading criteria for ovarian development level of female moths: 1 grade: there is a large amount of fat in the abdomen, the ovarian tube is transparent or the yolk is deposited below 1/3 ; Grade 2 : There are more fatty bodies in the abdomen, ovarian tube yolk deposition is above 1 / 3 or yolk deposition is completed ; Grade 3 : The fat body in the abdomen is significantly reduced, and a large number of mature eggs to be laid or part of the eggs have been produced in the ovarian duct; Level 4 : Very little fat body in the abdomen, atrophied ovarian tubes or only a small amount of eggs.
Second, the main symptoms and prevention and control measures 1, symptoms: larvae to eat leaf flesh, residual reticular epidermis, heavy time to eat the leaves, leaving only leaf veins. When large occurrences, it is also harmful to flowers and young buckwheat grains. 2. Prevention and control measures: (1) Agricultural control: winter ploughing and spring rake, destroying the wintering site, reducing the base of overwintering pests; artificially pulling nets when adults are feathered to spawn, or using high-pressure mercury lamps and black light lamps to trap adult insects; removing and deeply burying weeds in the field and on the edge of the ground, eliminating adult spawning sites, reducing the amount of eggs and larvae in the field, and reducing harm; digging insect-proof ditches to prevent the migration and spread of larvae from grassy beaches, barren slopes and forest belts to farmland; protecting and using natural enemies such as umbrella skirts to chase paraflies and control grassland borers. Chemical control: Before the larvae are 3 instars, 0.3% matrine (matrine) aqueous agent 800 times liquid, 52.25% agrolytic emulsion 1000 to 1500 times liquid, 25% xin · Cyanide (fast killer) emulsion 1500 times liquid, 25% insecticide (dimethalide) wettable powder 1000 ~ 1500 times liquid, 2.5% cypermethrin (kung fu) emulsion 2000 times liquid, 2.5% high efficiency cypermethrin (polyde) emulsion 2000 ~ 2500 times liquid spray. It can also be sprayed with 2% acarburicidal thiophos (borer pine) powder 1.5 to 2 kg per acre. Editor: Wang Yufang Review Expert: Guo Pingyi, Professor, College of Agronomy, Shanxi Agricultural University
【Source: Popular Science China Network】
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