Light trapping and killing of pests is highly effective, as many insect species are particularly sensitive to ultraviolet light with wavelengths between 330 and 400 nanometers. These pests exhibit strong phototaxis, making them easily attracted to light sources. This method is widely used for controlling various pests. Blacklight traps are typically set up from May to September. During the pest season, one blacklight is installed per mu (approximately 667 square meters), turned on at 9 PM each night and turned off the next morning. In warm, windless nights, the number of trapped insects is usually the highest.
For sex pheromone traps, a small round cage measuring 10 cm in length and 3 cm in diameter is used. Two non-mated 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. Placed in the field after dusk, these traps can capture hundreds of thousands of male moths in a single night.
The sweet and sour liquid trap 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 effective against pests such as cutworms, Spodoptera litura, armyworms, and pear borerworms. A pot is placed with the solution kept 3–5 cm deep, and one pot is set per acre. The pots should be placed 30 cm above the crop level for 15 days.
Poison bait trapping involves several methods. First, wheat bran, cottonseed, or bean cake is crushed and mixed with 0.15 kg of 90% trichlorfon per 5 kg of bait, along with enough water to form a paste. This is applied at 1.5–2.5 kg per mu to control underground pests like wireworms and ground beetles. Second, 40 pieces of banana or pineapple peels are mashed with 90% trichlorfon crystals and made into a paste. Twenty points per acre, with 25 grams per point, effectively controls fruit flies. Third, during the larval stage of the ground tiger, fresh grass is collected, mixed with 50 g of 90% trichlorfon in 1 kg of warm water, and sprayed on the grass. The treated grass is placed near infected plants in the evening.
Poplar twig traps involve bundling about 10 twigs that are 60 cm long and 1 cm in diameter, tying one end to a stick, and placing 5–10 bundles per mu. Soaked in a 300 times diluted solution of 90% trichlorfon, this method effectively traps pests like tobacco budworms, cotton bollworms, and armyworms.
Yellow withered grass is used to lure armyworms to lay eggs. By planting yellow withered grass in the field, eggs can be concentrated and then burned. Ten bundles are placed per mu.
Yellow boards made from cardboard or fiberboard are cut into 1 cm by 0.2 cm strips, painted yellow, and coated with sticky oil (a mix of motor oil and butter). These are placed 20–30 per acre at the same height as the crops to trap whiteflies, aphids, and leaf miners. Sticky oil should be reapplied every 7–10 days when the board becomes covered.
Plant decoctions use the feeding habits of pests. For example, planting castor around corn fields can attract and kill pests, while planting cotton in cotton fields can lure bollworms.
Before sowing vegetables, laying silver-gray strips in the field can prevent winged pests from entering.
Fresh paulownia or lettuce leaves are used to trap larvae. About 60–80 leaves are placed 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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