Tobacco caterpillar is a pest that appears during the growth of bell peppers. How to prevent and control the tobacco caterpillar in bell peppers?

The bell pepper tobacco caterpillar is a disease that devours bell pepper fruits and has a great impact on the yield and quality of bell peppers. Tobacco caterpillars are omnivorous pests that harm a variety of hosts. In addition to solanaceous crops such as tobacco, peppers, eggplants, and tomatoes, especially tobacco and hot peppers, it can also harm corn, sorghum, sunflower, pepper, peas, cabbage, pumpkin, cotton, and many other families. Damage from young insects that eat flowers and fruits has traditionally been classified as fruit-eating pests. When damaging hot peppers, the entire larvae burrow into the fruit, chew the peel and placenta, wrap the silk inside the fruit, and leave a large amount of feces, making the fruit inedible.

In order to eliminate overwintering pupae and reduce the source of insects, deep plowing and irrigation should be carried out after harvesting in severely damaged areas or fields. Eliminate eggs. Combined management during the peak period of spawning, collecting all burnt branches can eliminate some eggs; intercrop sweet corn according to local conditions to attract moths to lay eggs, and then kill the larvae in the heart leaves; spraying 0.2 oxalic acid on a small area in the field can also induce moths to lay eggs. Eggs; drawing on the fact that spraying 1 potassium dihydrogen phosphate on tomato plants during the egg-laying period of adult insects can prevent cotton bollworm moths, this method can be applied to bell peppers through experiments. Traps and kills adult insects.

Poison the larvae with chemicals. Spray biological agent emulsion, WHA-273 cotton bollworm polyhedrosis virus, etc. Spray with a mixture of organophosphorus and pyrethroids. Based on the prediction and investigation of field pest situation, it is known that when the larvae do not eat fruits before the third instar, 2.5 diclofenac 3000-4000 times solution, or 20 fenvalerate or 40 chrysanthemum EC 3000 times solution can be used, if conditions permit. Release Trichogramma wasps and release or assist in moving grasshoppers and ladybugs. The larvae eat buds and fruits and also damage stems, leaves and buds. The main reason for the reduction in yield is fruit rot and large amounts of fruit falling.

In severe cases, the fruit rot rate exceeds 30%. The adult body length is 15-18mm, the wing length is 24-33mm, the body color is yellow, the kidney-shaped line, the circular line and transverse line of the forewing are clear, the middle transverse line extends obliquely backward, but does not reach directly below the circular line, and the hind wings are dark brown. There are parallel lines within the broad band. The abdomen is yellowish brown, and there is generally no black phosphorus on the ventral surface. The egg is flat and hemispherical, about 0.4 mm high and 0.45 mm wide. The egg hole is obvious and the eggshell has a mesh pattern. Mature larvae are 40-50 mm long, with irregular patches on their surface and conical, short, blunt spines. The line between the hairs on both sides of the chest is away from the lower end of the chest flap. The pupa is reddish brown, about 17-20mm long, the front part of the body is thick and short, the flaps are small and low, and there are few protrusions.