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Harmful Control of Three Major Pests of Rape
After the larvae of the rape aphid have infested and flowered, the locusts mainly concentrate on the pedicels, causing deformities in the stems and darkening of the flowers. As a result, the pods fail to develop properly. In addition to direct damage, these pests also spread toxins, leading to even greater losses. For control, during the flowering stage, if 10% of the buds and flowers are infested with aphids, and an average of 3–5 aphids per bud is found, timely intervention is necessary. Effective treatments include using 10% imidacloprid at 20g per acre, or 4.5% beta-cypermethrin at 30ml per acre, or 3% acetamiprid EC at 40–50ml per acre, or 50% mancozeb wettable powder at 10–18g per acre, or 2.5% lambda-cyhalothrin EC at 10–20ml per acre. These should be mixed with water and sprayed directly onto the plants.
The cabbage butterfly, commonly known as the white butterfly, is also referred to as the cabbage caterpillar. Its larvae primarily feed on oilseed rape leaves, creating notches and, in severe cases, devouring entire leaves. Early-sown rapeseed tends to suffer more damage. It's crucial to control the pest before the third instar stage. Treatments include 90% trichlorfon crystals diluted 1000–1500 times, or 50% malathion EC diluted 500–600 times, or 2.5% trichlorfon powder diluted 800 times. Apply approximately 75kg of solution per acre, and spray the foliage when the dew has dried.
The yellow flea beetle is a common pest that affects vegetables and soil. Its larvae are often called white grubs. Both adults and larvae can damage rapeseed plants. Adults feed on the leaves, creating numerous small holes, and in severe cases, may completely defoliate the plant, leading to seedling death. The larvae attack the roots, stripping the outer layer and creating winding tunnels, which cause the upper parts of the seedlings to turn yellow from the outside inward, eventually leading to wilting and death. For control, apply 90% dichlorvos crystals diluted 1000 times to the roots for larvae, and spray 90% dichlorvos crystals diluted 1000 times or neem extract diluted 800–1000 times to control adult beetles. Regular monitoring and early intervention are key to preventing serious damage.