Occurrence of Spodoptera exigua in Chinese cabbage: In severe cases, the leaves may be eaten, leaving only veins and even stripping the stalk cortex. The larvae can migrate in groups and are slightly disturbed by spinning and landing. After 3 to 4 years of age, the plants are buried in the lower part of the plant or in the earth seams during the day and they are removed in the evening and eaten. 6-8 generations occurred in one year, more occurred in July-August, and there were more years of high temperature and drought. They often mixed with Spodoptera litura, posing a great threat to leafy vegetables.
Control methods:
(1) In combination with field management, timely removal of egg masses and worm leafs will be eliminated.
(2) The wall thickness of the insect body is fast, excretion effect is strong, and the drug resistance is strong. Prevention and control must be mastered as soon as possible, and spraying prevention and control of the ovary before the larvae of the first egg is not caused. In the occurrence period, every 3 to 5 days field inspection once, it was found that a bit of film should focus on prevention and treatment. Spraying should be done in the evening. Pharmaceutical use: Use card dead, anti-Cai Bao, farm music, fast killing spirit 1000 times, or Wan Ling, Paul, get 1500 times, timely prevention and control, will eliminate pests before the 3rd instar. For larvae of Spodoptera exigua above 3rd instar, spray 30mL/mu of the suspension with 30 chlorfenapyr and spray once every 7~10 days. Can achieve the desired control effect; to eliminate, Kak died, specializing in the best control effect. Can choose 50% high efficiency cypermethrin EC 1000 times plus 50% phoxim EC 1000 times, or add 80% DDVP EC 1000 times spray, the control effect is more than 85%. Can also be used 5% Suppository of EC, 5% Cascade EC, or 75% of farmland EC 500 times solution or 5% NOWP killing EC 1000 times spray control, 5 days control effect reached 90%.
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