What pesticide can completely kill tobacco budworms
The main host plants of the tobacco budworm are tobacco and chili peppers, and other hosts include tomato, pumpkin, datura, belladonna, groundcherry, black nightshade and other plants of the Solanaceae and Cucurbitaceae families. The damage is very serious, so what pesticide can kill the tobacco budworm?
1. What pesticide can kill the tobacco budworm?
On the basis of accurate forecasting, focus on control from the flower bud stage to the young fruit stage. According to the control threshold (2% of plants infested), apply pesticide promptly at the 1st to 2nd instar larval stage, that is, during the period before the larvae bore into the fruit to cause damage, so as to kill the larvae before they bore into the fruit. You can choose 2.5% deltamethrin emulsifiable concentrate at 2000 times, 2.5% cyhalothrin emulsifiable concentrate at 2000 times, 4.5% beta-cypermethrin emulsifiable concentrate at 1500 times, 5% Cascade emulsifiable concentrate at 2000 times, 35% Nomolt emulsifiable concentrate at 2000 times, 10% fenpropathrin-malathion emulsifiable concentrate at 1500 times, 48% chlorpyrifos emulsifiable concentrate at 1500 times, 21% methomyl emulsifiable concentrate at 4000 times, etc., and spray in the evening. Each pesticide may be used only 2 times per season, alternating pesticides to slow the development of pest resistance.
2. Agricultural control
Through tillage and cultivation, reduce the source of insects. In open fields, carry out winter plowing and winter irrigation to kill the pupae in the soil. In early spring, plant a row of early corn along the northwest edge of the green pepper field. After the shed film is removed, the adults fly to the corn plants to lay eggs, then remove the eggs and reduce the number of insects. Practice crop rotation. Promote the use of early-maturing varieties to avoid the damage period. Strengthen field management, clean the field promptly, and during the peak egg-laying period, combine pruning and shoot removal to remove leaves bearing eggs, reduce the number of eggs, remove infested fruits, and lower the pest population base.
3. Physical control
1. Poplar branch bundle moth trapping method: cut 0.6 m long leafy poplar branches, tie every 10 branches into a small bundle onto a wooden stick, and insert them in the field (slightly higher than the top of the pepper plants), 10 bundles per 667 sq m, replacing them every 5 to 10 days, generally starting from early to mid-April and continuing for 15 to 20 days. Every morning when the dew has not dried, put a plastic bag over the bundle to catch and kill the adults.
2. Black light moth trapping method: install one black light (220 volts, 40 watts) per 3.5 hectares, place a plastic basin under the light, fill the basin with water and add a small amount of laundry detergent, and from early to mid-April when moths first appear in the field, turn on the light in the evening until the next morning, which can kill large numbers of moths.
3. Electronic moth-killing lamp to trap and kill adults: that is, in unobstructed vegetable fields, install one lamp (220 volts, 15 watts) per 7 hectares, use a wooden stake driven deep into the ground for fixation to avoid swaying from strong winds, install the lamp fixture on the wooden stake, with the bottom more than 0.2 m above the top of the plants, and set up conspicuous warning signs or safety fences around the wooden stake. After it is powered on, do not touch the electric grid with your hands to avoid electric shock. Pay attention to line maintenance to avoid leakage. If the electric grid is covered with pest remains, be sure to cut off the power before cleaning it. After use for the year, store the lamp fixture properly for use the next year. It can kill phototactic pests of vegetables, rice, cotton, fruit trees, etc., and most are trapped and killed before laying eggs.
Control of tobacco budworm larvae should be carried out relatively early; once they become adults, control becomes more difficult, so it must be done as early as possible.