Autumn cabbage occurs during the growth process, causing serious damage to the yield and quality and reducing income. The mantle that harms autumn cabbage is a larva of radish flies. It belongs to the order Diptera, Felididae, and is a oligophagous pest. It mainly damages cruciferous vegetables such as cabbage and radish. Grasping the living habits and activity patterns of radish flies and adopting appropriate prevention and control measures can reduce or even eliminate the damage caused by the mantle on the autumn cabbage.
The radish flies occur one generation each year, and they spend more than 10 months in the dormant period of wintering in the earth. In the second year of adult emergence, it began to appear mainly in early August and continued until late September. In the middle and late August, it was the peak period. Adults come out in the morning, evening or tomorrow every day. When sunlight is strong at noon, they are hidden in the shade of cabbage. In autumn, the weather is warm and humid, and occurs seriously. After 1-2 days of rainfall or irrigation, the number of adults significantly increases. Adults were unearthed for about 7 days and spawned on top of the outer layer of the first and second layers of the cabbage and between the top soil and the topsoil around the base. The eggs are hatched as larvae after 4 to 7 days, and the larval period is about 30 days. After the emergence of the larvae, they first eat the cabbage pedicel base and the surrounding vegetable rags, and then eat the roots of the vegetables, which are bent insect paths or holes. When the temperature decreases, the damage is aggravated and the cabbage soft rot is easily induced.
According to the living habits of autumn cabbage mantle, its prevention can be divided into two phases.
When the ratio of male to female is close to 1:1 or the amount of adults suddenly increases, it is suitable for controlling the adult period. One is trapping. With sugar 0.5 kg, vinegar 1 kg, water 7.5 kg, plus 20 grams trichlorfon, made into a mixture, in early August, in the field every 8 to 10 meters to dig a bowl of large pit, according to the size of the pit Put in a plastic bag, pour 100 grams of the mixture, and add the mixture every 10 days to kill large numbers of adults. The second is to find a sudden increase in the amount of adults, the available 90% crystal trichlorfon 800 ~ 1000 times, or avermectin 1000 times, spraying once every 7 days, even spraying 2 or 3 times, you can get control effect.
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