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Harmful Control of Three Major Pests of Rape
After the larvae matured and the rape plants began to flower, locusts typically gathered around the pedicels. This feeding activity caused malformations in the stems and darkened the flowers, preventing the pods from developing properly. In addition to direct damage, the locusts also introduced toxins, leading to even greater losses. For control, it's important to act during the flowering stage when 10% of the buds and flowers are infested. If an average of 3–5 aphids per bud is found, timely intervention is necessary. 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. Alternatively, 50% antimony wettable powder can be used at 10–18g per acre, or 2.5% Kung Fu EC at 10–20ml per acre, all applied as a foliar spray.
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, causing notches and severe defoliation. The damage is more severe in early-sown crops. To effectively manage this pest, control should be applied before the third instar stage. Suitable 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 directly onto the foliage when dew has dried.
The yellow flea beetle, commonly known as the vegetable worm or soil flea, is another common pest affecting rapeseed. 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, they can completely defoliate the plant, leading to seedling death. The larvae attack the roots, stripping the outer layer and creating winding tunnels on the root surface. This causes the upper parts of the seedlings to gradually turn yellow from the outside inward, eventually leading to wilting and death. For control, apply 90% dichlorvos crystals diluted 1000 times to the roots to target the larvae. For adult control, use 90% dichlorvos crystals diluted 1000 times or neem extract diluted 800–1000 times, and spray directly onto the foliage. Regular monitoring and timely application are key to effective pest management.