Vegetable pods are a type of pest that damages rapeseed crops, and they commonly include three species: radish sprouts, cabbage sprouts, and peach amaranth. These pests often attack the same plants simultaneously. They feed on the sap of the rapeseed, causing the leaves to curl downward, the plants to turn yellow, and overall growth to become stunted. In severe cases, the plants may wilt and even die.
The cabbage caterpillar is actually the larval stage of a moth that infests rapeseed. Young larvae feed on the upper surface of the leaves, while older ones consume the foliage, creating holes in the leaves. In heavy infestations, only the petioles and veins may remain.
Vegetable pods also refer to the larvae of the diamondback moth, which damage rapeseed by burrowing into the leaf tissue or stems from the back of the plant’s heart. This feeding behavior can cause significant damage and weaken the plant.
Black-shelled insects are a group of beetles that harm rapeseed crops. Their larvae tend to gather on the underside of the leaves and inside the plant’s center, chewing holes and notches into the foliage. In serious cases, the leaves may be reduced to just the petioles and veins.
To control these pests, farmers can use a mixture of fresh high-fat membrane with 40% omethoate diluted at 800–1000 times, or apply 50% anti-influx at 10 grams per 50 liters of water. Other options include using a combination of rapeseed meal, cabbage caterpillar, rape meal, and black worm treatments. Additionally, a solution made from new high-fat film combined with 90% crystal trichlorfon or 80% dichlorvos EC diluted at 800–1000 times can be effective. Insecticides like 2.5% enemy killing, 2.5% time, and 20% chrysanthemum insecticide can also be used in combination.
Since most of these pests feed on the leaves and the growing heart of the plant, it's crucial to spray thoroughly on both the upper and lower surfaces of the leaves, as well as the central part of the plant. Proper application ensures effective pest prevention and protects the health of the rapeseed crop.
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