Occurrence and Control Technology of Tea Moth
Galvanized Australia Temporary Fencing,Galvanized Welded Temporary Fence Triangle Bending Fence ,Related Products Co., Ltd. , http://www.chsteelmesh.com
December 17 06:09:41, 2018
Tea moth, scientific name Caloptilia theivora (Walsingham) Lepidoptera, Phyllobidae, common name Trichostrongylus leafroll moth, mainly harm tea, camellia. At the end of the last century, it was the main pest on tea plants in our province. 1. Injury characteristics The larvae sneak into the young leaves of the tea tree or roll into the triangle to hide and feed. This affects the yield and quality of the tea. When the rate of triterpenoids is higher than 3%, it will affect the quality of the tea. 2. Morphological characteristics Adult body length 4-6 mm, 10-10 mm wingspan, head, chest dark brown, compound black, yellow hair face. Antenna filamentous, brown. The front wing has a lustrous brown luster and a golden yellow triangle pattern near the center has reached the front edge. Dark brown hind wings, long hair. Egg length 0.30-0.48 mm, flat oval, colorless, with a drop-like luster. The last instar larvae were 8 to 10 mm in length, and the larvae had 5 instars: 1 mm in age, 1.5 mm in 2nd instar, 2.5-4.0 mm in 3rd instar, and 10 mm in 4 instars. The larvae are milky, translucent, mouthparts brown, monocular black, body surface with short white hair, younger stage body is slightly flat, head small chest is large, the abdomen is gradually thin from the front, the posterior body is cylindrical, can see dark green to purple black Digestive tract. 5-6 mm long, cylindrical, light brown. Ventral and wing buds light yellow, compound eyes red brown. The dragonfly is 7.5-9 mm long, oblong, gray-white. 3. Living habits Songyang, Zhejiang Province has 7 generations of annuals. It lives in the lower part of the tea tree or leaves in the depression of the old leaf. Winter in the spring of April. Feathering and spawning. The first generation in late April and late second generation in May. Three generations from late June to early July, four generations in late July, five generations in late August, six generations in late September and early October, seven generations in mid-November, four generations after the generation overlap, with 5-6 generations The most important. Adults are active and copulate at night and have phototaxis. Two to three days after emergence, the eggs were laid on the back of young leaves, the second leaves were the most under the buds, followed by three leaves, few on buds, and the number of grains on one leaf was several tens to several tens of eggs. 44-68 tablets, more than generations less. The first and second instars are the leaf stage, the third and fourth instars are the crimping stages, and the fourth and late instars and the fifth instars enter the rolling stage. The tip of the leaf is rolled into the leafhopper back to the triangle insect's nest, hiding the Suizhongju leaf feeding meat. The larvae often turn to earthworms and pile up the feces in the earthworms, seriously affecting the quality of tea. After the mature larvae crawled out of a hole in the bite, the old leaf or the back of the leaf was rewheated. The egg period of 3-5 days, 9-40 days larvae, non-overwintering 7-16 days, the adult life of 4-6 days. There are many buds in the retired tea gardens and young tea gardens, which will take place. Every summer is heavy. Temperature rises above 28°C, adults are more likely to die, spawning is less, and lighter damages occur from July to August. The main natural enemies are cone-bellied wasps. The parasitism rate is about 20%. A variety of spiders prey on the tea moth adult and larvae. 4. Control methods (1) Collect tea in batches, pay attention to the removal of insect leaves, and reduce the spawning sites and foodstuffs of the insects. (2) Strengthen management of tea gardens and find that insects are removed in time and burned or buried deeply. (3) Spray 35% chlorpyrifos EC 1500-2000 times or 80% dichlorvos EC 1000 times and 2.5% cyfluthrin EC 4000-5000 times in the leaf stage.