Species name: Yellow slug
Family Name: slug Division
Species Latin name: cnidocampa flavescens (walker)
Domestic Distribution: In addition to Ningxia, Xinjiang, Guizhou, Tibet is currently no records, almost all over the other provinces
Overseas Distribution: Japan, Korea, the Soviet Union (Siberia)
Characteristics: adult female moth body length 15-17 mm, wingspan 35-39mm; males body length 13-15 mm, wingspan 30-32 mm. Body orange. Forewings brown, since there is an angle in the room stretched thin slash, slash the side in yellow, the foreign brown; in the brown part has a dark brown thin air extending from the trailing edge angle of the middle term, the Room with 1 part brown dots. Hindwing greyish yellow. Egg flat oval, slightly pointed at one end, long 1.4-1.5 mm, width 0.9 mm, yellow, egg membrane of turtle-shaped sculptured. Larvae mature larva body length 19-25 mm, thick body. Brown head, hidden under the chest. Yellow-green breast, body from Section II, the back line on both sides of each section 1 on the technology thorn to the third, fourth, ten for the big, technology long black bristles on the thorn; dorsal large, brown, purple markings, before and after the large, narrow and thin as a dumbbell-shaped middle, distal on the back with 4 small brown spots; body 9 thorn on each side, there are two central style blue vertical stripes, light cyan on-line valve, valve under yellow line. Pupae oval, thick. Body length 13-15 mm. Pale yellowish brown, head, chest on the back of the yellow, abdomen brown back of each section back. Oval cocoon, quality hard, dark brown, with irregular longitudinal white stripes, mimicking bird eggs.
Biology: Liaoning, Shaanxi, 1 occurred in a generation, Beijing, Anhui, Sichuan 1 year 2 generations. Hefei yellow slug caterpillars in October at the trunk and branches Liu cocoon for the winter. Pupate in mid-May the following year, in late only to see the adult. May to late June for the first generation of eggs for the larvae, 6-July period, June to August in mid-to late-wan period, July to late August for the adult stage; the second generation of larvae occurred in early August, October cocoon through the winter. Adult emergence and more in the evening, when the 17-22 Shing. Adults nocturnal, phototaxis is not strong. Female moths lay eggs more in the dorsal, egg production or the number of tablets to do together. 49-67 eggs per female tablets, 4-7 days of adult life. Larvae hatch during the day and more. Newly hatched larvae eat the egg shell first, and then feeding on leaf epidermis and mesophyll, peel the skin, forming small round transparent, connected across a small block of the future. 4 instar feeding on leaves pores; 5,6 larvae can eat the whole leaf leaving only veins. Young mixed by the diet, eating around trees, fruit trees, different species: Jiangsu Taihu Lake region, in order to harm maple, hackberry based; based in Harbin for apples; in Qingdao to apple, pear, peach-based; central Jiangxi to pick the main; Yang Shan in Anhui apple fruit area in the main, the main Huaiyuan pomegranate, Hefei yellow slug caterpillars first generation multi-hazard maple, walnut; the second generation of larvae and standard multi-hazard class pear leaves. Larval age of 7. The first generation of larvae of different ages are required to return the number of 1-2-3 days 2 days 3 days 2-2-4-5 days 3 days 5-7 days, 6 to 8 days; a total of 22 - 33 days. After the larvae mature silk cocoons in the branches. The beginning of a transparent cocoon, showing that larvae activity, after the British hard-cemented. The beginning of the white British, and soon become brown and white vertical lines showing. Cocoon Location: In the tall trees on the bifurcation of multiple branches, nursery stock on the knot in the trunk. Year 2, the first generation of larvae on behalf of the British small and thin end of the second generation of large, thick cocoon. The first generation of larvae is also available on the main leaf veins on the leaves of David and cocoon. Natural enemies Shanghai Qingfeng, wide shoulders and wasp sting Mindanao, a ichneumonids cmptus sp. , Mantis, nuclear polyhedrosis virus.
Control methods: 1. Manual control (1) dealing with multiple larvae of the green slug slug, such as Korea, diffuse green slug, slug, etc. to be vertical with the ball more than a cluster of young larvae feeding, the victim leaves appear white or translucent plaques and so on, even easy to find. At this time a large number of habitat patches often near the larvae, timely removal of parasite branches, leaves, to be addressed, the effect is obvious. Many slug of mature larvae usually along the trunk base or ground down The cocoon can be tied to the trunk to clear grass and other methods in a timely manner. (2) removal of overwintering seedlings overwintering cocoon slug up to 7 months. At this point in agriculture, forestry operations more free, according to different insect species of slug used hibernation sites of the similarities and differences between knock, digging, cutting off other methods clear the cocoon. Leather candle to concentrate closely with gauze, feathering out the natural enemies of pests. To avoid poisonous hairs on the victims of the cocoon, the cocoon can be buried 30cm deep in the pit, the step real buried dead.) 2. Most of the light trap and kill the adult slug phototaxis with a strong, adult emergence at the time of use in 19-21 light trapping. 3. Chemical control system for young moth larvae sensitive to insecticides, the general contact insecticide can be effective. For example, 90% trichlorfon liquid crystals 8000 Shun Lee on the longitudinal moth ball to be 1500 times on the yellow slug; 1000 times on the theft of slug, slug saxatilis, white German Cha slug; 80% of the dichlorvos EC 2000 wave of the longitudinal information required to slug the ball, 1,000 times on the date of slug, exposed edge of the slug, the white mole Cha slug; 50% malathion EC, 2000 times the ball shall be vertical with a slug and black eyebrow slug; 2.5%? Deltamethrin on the exposed edge of the slug 4000 times, 5000 times on saxatilis slug; 20% fenvalerate times with the book are very effective on saxatilis slug. In addition, 50% fenitrothion used EC, 50% phoxim EC, Parathion EC 50%, 25% EC 1500-2000 Phosmet times, 2.5% and 3% West trichlorfon powder Vein powder to control. 4. Biological Control of slug parasitic natural enemies more, such as yellow slug has been found to have slug parasitic natural enemies of purple hee bee, wasp slug broad shoulders, Shanghai Qingfeng, Ichneumonidae Java slug, slug to send strong British bee flies and a pile (the scientific name of unknown origin). To be slug the ball vertical, Lai green slug, slug eggs yellow edge-level predators have Trichogramma thehmpmma sp. ; Slug larvae are natural enemies of Beauveria bassiana, caterpillar fungus, branches polyhedrosis virus, should pay attention to protection and utilization. Use of the natural enemies, such as the 2.3x10 '-2.3 x 10' / ml, the concentration required to slug the ball vertical nuclear polyhedrosis virus, pest control, the effect of 100%; to this disease into larvae non-incidence areas, the larvae can incidence of non-disease area more than 90%; to susceptible larvae (including cocoons) crushed, soaked in water 24 hours, centrifuged for 10 minutes to extract 20 billion rental pib / ml nuclear yellow slug polyhedrosis virus diluted 1000 times Pensha 3-4 instar larvae, the effect of 76.8-98%. Shanghai Green Hornet is a common natural enemies of yellow slug, Jiangsu Qingjiang City Nursery, application of slug protection cocoon cocoon under the mining, where they make Green Hornet fly after emergence. Been the case so that the parasitic rate of barbed Mindanao up to 26% the first year, second year 64%, 96% the third year. |
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