The cabbage caterpillars occur in various places and are important pests on cruciferous vegetables. The worm in our county mainly harms cruciferous vegetables such as cabbage, radish, canola, and vegetables, and prefers thick leafy vegetables.
First, the damage characteristics of larvae bite the host leaves, before the 2nd instar only to eat the leaves, leaving a layer of transparent epidermis, 3rd instar after eating encroaching holes or nicks, in severe cases, all the leaves were eaten, leaving only the residual veins and petiole, resulting in Out of production, it is easy to cause the epidemic of soft rot of cabbage. When the cabbage caterpillar feeds, it will pollute the feces while feeding. The larvae were 5th instar. Before the 3rd instar, they were damaged on the back of the leaf. After the 3rd instar, the larvae turned to foliar nibbles. The feed intake of 4-5th instar larvae accounted for 97% of the total larval feed intake.
Second, living habits and occurrence of the law Pieris caerulea occurs in our county every year 4 to 5, overwintering adults emerged in March, with the most serious damage from late May to June, July and August due to high temperatures and rain, natural enemies increased, the lack of host As a result, the number of insect populations decreased significantly, and the number of insect populations rose back in September to form a second peak of damage. Adults are active during the day and live the most at noon on sunny days, with a life span of 2 to 5 weeks. Spawning has strong tropism for cruciferous vegetables, especially for thick leafy cabbage and broccoli with a large amount of eggs, which is produced on the back of leaves in summer and on the front of leaves in winter. Oviparous spawning, larvae sluggish, not lively, more mature after climbing to high dry not easy to soak in the water phlegm, non-overwintering is often at the bottom of the plant leaf blade or petiole larvae, and spinning silk body tangled in attachments on.
Third, prevention and control measures In recent years, the occurrence of cabbage caterpillar harm is serious, in the process of chemical control, the rapid emergence of drug resistance, resulting in difficult control of cabbage caterpillar. The focus of its prevention and treatment is timely prevention and control, and alternate medication. Specific prevention methods are as follows. 1. Agricultural prevention and control of the clean garden, cruciferous vegetables after the harvest, timely removal of old leaves in the field, to reduce the breeding sites of cabbage caterpillars and to eliminate part of the eel. 2. Chemical control generally takes about 1 week after the peak of the egg, ie, the larval hatching period to the 3rd instar larvae before use, continuous use 2-3 times, prevention and control should pay attention to seize the appropriate period of control, in the field of eggs, larval hatching Early spraying, according to cabbage green habits, in the morning or evening on the back of the plant leaves evenly spraying, can effectively control the damage of cabbage caterpillar.
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