The scientific name Lygocoris lucorμm (Meyer-Dur.) is synonymous with lygus lucorμm Meyer-Dur. The original name of the worm was Lugus, and it was modified by Mr. Zheng Ledi as Lygocoris, belonging to the order Hemipteridae. Aliased mosaic insects, small bugs, etc. Several times across the country's cotton districts. It is the dominant species of multiple melting elephants that damage cotton in the Yellow River basin and the Yangtze River basin in China.
Host cotton, mulberry, hemp, beans, corn, potatoes, melons, alfalfa, medicinal plants, flowers, artemisia, cruciferous vegetables.
Injury characteristics, nymphs sucking cotton plant apical buds, young leaves, flower buds and young bells on the sap, the young buds suffer the formation of only two pieces of fat cotyledons of "public" cotton. The leaves suffer from the formation of "broken leaf madness" with a large number of holes and wrinkles. Axillary buds and growing points suffer from axillary buds and broken leaves resemble broom seedlings. The young buds become yellowish-brown or fall off. The cotton bolls were covered with black spots and inflexibly ringed.
Morphological characteristics Adult body length 5mm, width 2.2mm, green, dense short hair. The head is triangular in shape, yellow-green, compound eyes are black, no single eyes, the antennae are filiform and shorter, about 2/3 of the body length, and the length of the 2nd section is equal to the sum of 3, 4 knots, and the color gradually darkens toward the end. Section 1 is yellow-green, and 4 is dark brown. The pronotum is dark green, with many small black spots and a wide front edge. Small scutellum triangle slightly protruding, yellow-green, central with a shallow vertical pattern. The fore wing membrane is translucent dark grey and green. Yellow and green, yellow knots at the end of the intestine, dark color, and brown ring spot at the end of the hind leg. The hind leg of the female is shorter than the male, and does not exceed the end of the abdomen. The thigh section is 3, and the end is black. The eggs are lmm long, yellow-green, long-pocket-shaped, yellow-colored egg caps, and central depressions with raised ends and no appendages on the edges. The nymph is 5 years old and similar to the adult. It is green when it is newly hatched and pink in compound eyes. 2nd-instar yellow-brown, 3rd instar wing buds, 4th instar over the 1st abdominal segment, 2, 3, and 4th instar antennae and foot dark brown, 5th instar, all dark green, densely covered with dark hairs; antennae pale yellow, terminal Deeper color. Eyes gray.
Living habits: 3-5 years old in the North, 4th generation in Yuncheng, 5th generation in Fuyang, Shaanxi, 5th generation in Anyang, Henan Province, and 6-7th generation in Jiangxi Province. Eggs are in the cotton trunks, shells or pods, ramie stalks, pods, or fruit bark. Winter breaks in the branches and in the soil. In the spring of March and April, the average temperature is higher than l0°C, or the average temperature is 11°C for 5 consecutive days. The relative humidity is higher than 70% and the eggs begin to hatch. The 1st and 2nd generations lived in the green manure fields such as the Ziyun sorghum and Chinese wolfberry. Adults live long, spawning period of 30-40 days, the occurrence period is not neat. Adults have strong flying ability and prefer to eat nectar. They lay eggs 6 or 7 days after emergence. Non-overwintering eggs spawned in young leaves, stems, petioles, veins, tender buds and other tissues, exposed yellow egg cover, egg period 7-9 days. In mid-June, after budding, cotton moved into cotton fields and peaked in July. In late August, the buds of cotton fields became scarce and they were moved to other hosts to injure vegetables or fruit trees. Fruit trees suffer heavy damage in spring and autumn. The main natural enemies include parasitic wasps, grasshoppers, and predatory spiders.
Control methods (1) Before hatching eggs in early spring, remove cotton fields and nearby weeds. When the eggs have hatched, spray 50% methamidophos EC or 50% methyl parathion 1500 times on the host of overwintering insects. Reduce overwhelming insect sources. (2) When 100 plants, 1-2 nymphs, or newly damaged plants reach 3% from the seedling stage to the budding stage of cotton, they are immediately treated with 40% monocrotophos or 50% methamidophos. Can effectively control a variety of blind melting, worms and leafhoppers, and does not harm the natural enemy insects. See methods for cotton aphid. (3) In the adult stage, spray 35% Sai Dan EC or 10% imidacloprid wettable powder or 10% dilute EC or 20% MTD emulsifiable concentrate 2000 times solution, 5% Supiophos EC, 25% Guangkewei EC 2,000 times Liquid, 50% methyl parathion 1500 times, 25% thiofuran EC 1500 times, 5.7% chrysanthemum EC 2000 times, and 43% New Braun EC (CVH) 1500 times liquid.
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