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The larvae are omnivorous pests and endanger more hosts than tobacco, pepper, eggplant and tomato of Solanaceae crops, especially tobacco and spicy sweet peppers, and they can also harm corn, sorghum, sunflower, and sorghum. Many crops such as peas, cabbage, pumpkins, and cotton.
What are the hazards? The larvae eat flowers and fruit and are harmful to fruit. When the spicy (sweet) pepper is jeopardized, the entire larvae penetrate into the fruit, feed on the skin and placenta, and are silk-embellished, leaving a large amount of feces and making the fruit inedible.
Morphological characteristics? Adult tobacco insects called tobacco budworm, is a medium-sized brown moth (body length 14 to 18 mm, wings 27 to 35 mm), forewing length shorter than the body length, wings on the kidney pattern, ring pattern And each horizontal line is clearer. The larva body color changes greatly, there are many kinds of green, gray brown, green brown. The mature larvae are green-brown, about 40 mm long, and have a smooth body surface with white dotted lines on their backs. Each section has knob-like protrusions and black short hairs on the upper part.
H. assemblage is very similar to that of cotton bollworm. The difference is that the body color of the adult is yellow, and the line patterns on the forewings are clear. There is a brownish black line on the inner side of the wide-brown middle of the hind wing and the inner side is slightly concave. 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.
Living habits? In North China for 2 generations a year, wintering in the earth with crickets; South China 5 generations a year, with crickets in the soil as a winter room for soil. Adults grow up overnight, and the eggs are produced in the middle and upper leaves near the leaf veins (early period) or on the fruit (later period), and yield. Adults have strong tendencies towards wilting poplar branches, tendencies toward molasses, and weak phototaxis. The larvae have a false death and can be transformed into fruit. There are natural enemies such as Trichogramma, Ic, Beetle, Grasshopper, Ladybug and Spider.
Control methods
1, winter plowing. Seriously endangered areas or fields should be sowed after deep-irrigation irrigation to eliminate overwintering insects and reduce the source of insects.
2. Elimination of eggs. 1In the period of spawning, combine the management, collect the broken sticks that burned and smashed, and destroy some of the eggs; 2 Intermittle the eggs of sweet corn with insects in order to lay eggs, and then eliminate the larvae in the heart; 3 Spray in small areas in the field 0.2 % of oxalic acid can also attract moths for spawning; 4 reference tomato in the adult spawning period of plants spraying 1% potassium dihydrogen phosphate can avoid bollworm moth, this method can be applied to the sweet pepper on the test.
3, trapping adults. 1 Put Yang Zhi to attract moths (cut about 70 cm long with Populus lanceolata, 10/barrel, 150 bar/ha, insert into the field slightly higher than the plants, 5 to 6 days in half, each generation of moths 15 to 20 Day and evening, inserting and catching moths in the morning when the dew is dry); 2 Blacklight trapping (20 watts of black light 1 ç›/3 hectares).
4. Chemical control? 13 years before spraying biologic agents (such as 7217 Streptomyces, 7216 bacterium powder, acaricidal bacillus powder, human worm powder, Bt (Bacillus thuringiensis) emulsion, WHA-273 cotton bollworm polyhedra virus, etc. Instructions for use); 2 spray organic phosphorus, pyrethroid mixture. On the basis of surveys and field pest investigations, the larvae were trained on the fruit before the third instar (20 to 30 eggs/100 strains were sprayed, and 5 larvae/100 strains were applied after spraying). 1 time), 2.5% of the drug can be used to kill 3 000 to 4 000 times, or 20% of cypermethrin or 40% of chrysanthemum oil 3 000 times, or 2.5% of Kung Fu EC 4 000 to 5000 times. , Or 2.5% Uranus EC 3 000 times, or 10% Chrysanthemum EC 1500 times, or 21% to kill EC 5000 to 6 000 times, alternating spray.
Heliothis
Chili was also known as Heliothis virescens or Heliothis assulta Guenee. It was classified as Lepidoptera and Noctuidae.