Scientific name Helicoverpa assulta (Guenee) Synonyms Heliothis assulta Guenee Lepidoptera, Noctuidae. Alias ​​tobacco budworm, tobacco budworm, tobacco budworm, green cloth bagworm, greenworm. Widely distributed in various domestic tobacco areas, all countries have distribution.
Host tobacco, cotton, pepper, corn, potato, flax and other more than 70 kinds of plants.
The larvae are mainly responsible for the damage to the top leaves of the tobacco plants, eating into nicks or holes, and sometimes eat the leaves and leaves veins. Seriously affect the yield and quality of tobacco. The morphological characteristics are very similar to those of cotton bollworm. The difference is that the adult body has a yellow body color and the line patterns on the forewings are clear. There is a brownish black line on the inner side of the broad brown and black midline of the hind wing and a slightly concave outer side. The eggs are slightly flattened, and the longitudinal ribs are long and short, showing a double-order pattern, and the egg holes are obvious. The larvae of the two anterior thoracic hair (L1, L2) line from the lower end of the chest valve; body surface shorter thorns. The front part of the corpus callosum is thick and short, the valve is small and low, and it rarely protrudes.
Habits of life 3-6 generations, to the winter in the 7-13cm soil. Shandong and Henan are born in 3-4 generations; Anwei, Jiangsu and Zhejiang are in the 4th to 5th generation; Southwest tobacco areas are 5-6 generations, overlapping in generations. China's Huanghuai tobacco area 1 to 3 generations of serious damage, 100 to 50 of tobacco insects. Adults live 5-7 days, lurking in the back of the leaves or in the grass during the day, and they are active at night or on cloudy days. They have phototaxis. Eggs are prolific in the front of tender tobacco leaves. Each female produces nearly 1,000 eggs. The spawning period is 4-5 days and the egg period is 3-5 days. The larvae are 6-7 years old, 11-25 days of larval stage and 10-17 days of pupa stage. The larvae suffered from circadian infestation before the 3rd instar. After 3rd instar, their food intake increased rapidly. They were mainly active at night, and had the habit of transforming plants and killing each other. They lurked under the leaves during the day and had a feign death. The severity of the insects in the tobacco fields was related to the number of overwintering insect populations, the growth of tobacco plants, climate, and natural enemies. The production of tobacco plants has a dense growth, suitable temperature and humidity, and is easy to happen. From July to August, the average temperature is higher than 30°C, and relative humidity less than 80% occurs light. The main natural enemies are Australia's Trichogramma, tooth lip, and so on.
Control methods (1) Agricultural control 1 Deep ploughing. Autumn and winter deep turn tobacco fields, cutting off the plume of the plume, can reduce the source of insects. 2 In the morning or in the cloudy days, seedlings can be caught or put on chickens or ducks when they see fresh insect waste. (2) Biological control. Put each gram of acaricidal powder containing more than 10 billion viable spores against water 300 to 500 times or spray 400 times of virulent powder containing viable spores per gram of 400 times water to the back of the tobacco heart leaf, to the 3rd instar larvae Effective control. (3) Control of chemicals The spraying of 90% crystal trichlorfon or 50% methionine, 50% phoxim, and 25% chlorfenuron 1000 times liquid was started at the larval stage. Can also be sprayed with 90% of Wanling WP 3000-4000 times or 32.8% of cotton-protected Dan Emulsion per 667m2 of 53ml, 20% Confodic Concentrate Solvent, 6-8ml per 667m2. In addition, 5% phoxim granules or 2.5% trichlorfon powdered fine soil (1:1) can be used and sprinkled 1-1.5kg per 667m2.
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