Light trapping and killing of pests is highly effective, especially for those with optic nerves sensitive to ultraviolet light in the 330–400 nm wavelength range. These pests exhibit strong phototaxis, making them easily attracted to black lights. This method works well for trapping a variety of insects. Blacklight trapping is typically conducted from May to September. During pest outbreaks, one blacklight is placed per mu (approximately 667 square meters), turned on at 9 PM each night and turned off the next morning. On windless, warm nights, the number of trapped insects tends to be highest.
For sex traps, a round cage measuring 10 cm in length and 3 cm in diameter is used. Two unmated female moths are placed inside each cage, or commercial attractants can be used instead. The cages are hung over basins filled with water and a small amount of kerosene. When deployed after dusk, these traps can capture hundreds of thousands of male moths in a single night.
Sweet and sour liquid bait is another effective method. It consists of 6 parts sugar, 1 part wine, 2–3 parts vinegar, 10 parts water, and an appropriate amount of trichlorfon. This mixture is used to trap pests like cutworms, Spodoptera litura, armyworms, and pear borerworms. The bait should be placed in pots with a depth of 3–5 cm, positioned 30 cm above the crops, and left for 15 days.
Poison bait trapping involves several methods. One approach uses crushed wheat bran, cottonseed, or bean cake mixed with 90% trichlorfon crystals (0.15 kg per 5 kg of bait) and water. This is effective against underground pests like earthworms and ground beetles, applied at 1.5–2.5 kg per mu. Another method uses 40 banana or pineapple peels mixed with trichlorfon to form a paste, applied at 20 points per acre (25 g per point), targeting fruit flies. During the larval stage of ground tigers, fresh grass is treated with 50 g of trichlorfon in 1 kg of warm water and sprayed on young grass, then placed near infected plants for effective trapping.
Poplar twigs, about 60 cm long and 1 cm in diameter, are bundled into groups of 10 and tied to a stick. Placed at 5–10 sticks per mu, they are dipped in a 300-times diluted solution of 90% trichlorfon to trap pests such as tobacco budworms, cotton bollworms, armyworms, and Spodoptera litura.
Wilted yellow grass is used to lure armyworms to lay eggs. By placing 10 bundles per mu, this method helps concentrate egg-laying and facilitates egg destruction.
Yellow boards made from cardboard or fiberboard, cut into 1 cm by 0.2 cm strips and painted yellow, are coated with sticky oil (a mix of 10th motor oil and a little butter). These are set at 20–30 per acre, at the same height as the crop, to trap whiteflies, aphids, and leaf miners. Sticky oil should be reapplied every 7–10 days.
Plant decoctions use the natural attraction of pests to certain plants. For example, planting castor around corn can help control pests, while planting cotton in cotton fields can lure cotton bollworms.
Before sowing vegetables, laying silver-gray strips in the field can prevent winged pests from entering.
Fresh paulownia or lettuce leaves are placed at 60–80 per acre in the afternoon and collected the next morning for 3–5 consecutive days, effectively killing large numbers of larvae.
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