Scientific name Andraca bipunctata Walker is Lepidoptera, silkworm moth family. The common name is tea dog, tea silkworm, non-toxic caterpillar and so on. Widely distributes tea production areas throughout the country.
Host tea, oil tea.
The larvae gnaw on the leaves of the larvae and eat them into light stalks, which not only affect the growth and development of tea plants, but also affect the yield and quality of tea.
Morphological characteristics of female moth body length 12-20mm, wings 26-60mm, body brown, velvet-like luster, thoracodorsal hair. Antennae enamel short, nearly filiform. The wings of the forewing wings protrude outwards slightly into hooks, and the dark brown wavy stripes of the wing masks are located at the Asian-Outer edge line, the middle horizontal line, and the inner horizontal line, and the near-Asian outer edge line slopes inward from the vertex angle. There is also a tan line pattern at the trailing edge. There is a black spot between the horizontal line and the horizontal line. Male moth body length 12-15mm, wings 26-40mm, body, wings brown. Tentacle feathered. The wing shape of the forewing wings is not obvious, and the line pattern of the wing surface is the same as that of the female moth. The line pattern is brownish black, and each wing tip and the middle part of the outer edge line of the near Asia have a grey and white spot. The egg is 1.2mm long, oval, light yellow, later orange, purple before hatching. Eggs are tiled into blocks, mostly composed of 2-5 rows, and the eggs are nearly round to rectangular. The last instar larvae have a body length of about 60 mm. Newly hatched larvae 3.5-7mm, black head, yellow chest and abdomen. Growing larvae are hypertrophied, with dense hairs on their bodies, dark brown heads, and brown chest and abdomen. There are 11 vertical lines on the body, and 3-4 horizontal strips of gray and white lines are formed on each body, forming a number of small squares with vertical lines. There is a square black spot on both sides of the back line of each section, and there is a round black spot and an orange spot on each section near the valve line. The beak is 17-22mm long, spindle-shaped, dark reddish-brown, with yellow-brown hairs on the tail. It is about 22mm long, silky, oval, grayish-brown to brownish-yellow, with shards and soil particles on the outside.
Life habits are two generations in Anhui, Zhejiang, Jiangxi, Hunan 2-3 generations, Guangxi, Fujian, Taiwan 3-4 generations, Guangdong 4 generations. Anhui, Jiangxi, and Zhejiang overwintered. In the second-generation region, mid-April mid-April to early-May, the adults of the overwintering population emerged. The first and second generations of larvae were infested from April to May from 19 to 10 months; the 3rd generations were overwintering adults in late March. The larvae of the second, and third generation larvae were infested from April to May, from June to early July and from September to October; in Fujian, larvae were seldom used as winter eggs, and larvae were hatched from February to March in the following year. The larvae are infested from early February to early April, late May to late June, and the second generation begins in late June and late summer. After the first half of September, the summer nymphs are gradually emerged and the third-generation larvae are destroyed. From early October to mid-November. The duration of each insect: Jiangxi repair water egg period 7-24 days, larvae 25-150 days, adult life 5-9 days; Fujian Fuan egg period 8-13 days, larval period 18-27 days, flood season 21- In 34 days, the adult life span was 6-10 days, but the overwintering eggs and larvae were 60 days and 62 days respectively, and the summer days were 64-82 days. The life span of the uninhabited adults was about 15 days. Adults emerged from early evening to early morning, mostly from 6 to 10 o'clock in the evening and from 4 to 6 o'clock in the morning. Most of the feathers that emerged at night were male moths. Most of the females that emerged in the early morning were female moths. The female moth is stupid and weak in flight, generally climbing on the top of the branch and waiting for the male moth to copulate. The male moth is not strong enough to fly. It can only flutter within a distance of 1m from the ground and 10m in diameter. It is most active in the early morning and dusk. When noon or sunshine is strong, it often lurks in the hidden areas of the tea bush or the soil surface of the rhizosphere. Phototaxis is not strong. Two to three hours after the emergence of adult ecloses, the tails lasted for 4 to 12 hours, and for 80 to several hours, they were copulated once or a few times 2 to 3 times. The female moth lays eggs after 4-5 hours of mating, and 20-100 pellets are produced on the back of leaves. A small number of eggs per female were spawned, more than 270 tablets, an average of 120 tablets. Female moths that did not copulate could lay eggs but did not hatch. Eggs hatched neatly, and the same egg was generally hatched within 1-2 days. The larvae prefer to cluster. The 1st instar larvae gather or feed at the ovipository; the 2nd instar larvae often cluster in the dorsal part of the leaf from the leaf margin, feeding from the leaf margin inward, leaving only the main veins, and the group is moved to another after eating a leaf. The leaves are harmed; after 3rd age, they are transferred to the branches or crowded into a mass, and a large number of encroaching on leaves, eating a bundle, a branch, and transferring his branches at night damage. The larvae continue to divide as the larvae grow. In the last group, only about a dozen mature larvae typically climb to the deciduous roots of the tea tree roots or pods in the topsoil. Natural enemies include black egg bee, fly-flying, ichneumon, and birds.
Prevention methods (1) Remove overwintering mites in the roots of tea in winter. (2) Manual killing. (3) When the hatching rate reaches 16% to 20%, the I-III instar larvae duration in the same period of the year can be pushed backwards, which means that the hatching period is appropriate. Each 667m2 contains 0.5kg of powder of Bacillus thuringiensis spores of 10 billion; spray of 100kg of water can also be sprayed with 0.5kg of water and 500kg of water. Promote the application of Bombyx mori granulosis virus (Ab-Gv) 1000-2000mg, spraying 50kg of water. (4)Spray 90% crystal trichlorfon or 50% malathion EC, 50% killer pine EC 1000 times, 80% Dichlorvo EC 1500-2000 times, from the incubating period of the larvae to the young stage. The .5% enemy killed 4,000 to 5,000 times that of EC and 1500 times that of 25% of ECS.
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