Plutella xylostella is also known as hanging filar, and it is one of the main pests of cabbage, cauliflower, radish, cabbage, and other crops. The generation of the diamondback moth is 10-13 generations per generation, and the damage is the heaviest in autumn.
The adult worms have phototaxis, most of them are active at night. Each female female can lay 200-300 eggs, up to 500 or more, and the larvae have the habit of avoiding light. The newly hatched larvae lurk on the back of leaves for a short period of time. After the time, they intruded between the upper and lower epidermis of the leaves, and ate the lower epidermis and mesophyll, so that many transparent plaques appeared on the leaves of the cabbage. Overeating larvae sometimes ate with the epidermis, leaving only the veins. And petiole. The larvae have a total of 4 instars, and the mature larvae have a body length of 10-12 mm and are pale green and spindle-shaped. When the temperature drops, most of the larvae are transferred to the heart of the cabbage, sometimes also at the base of the leaves. Severely damaged cabbage, leaves and outer leaves will appear transparent light spots, both affect the quality and reduce production.
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