Lepidoptera Diptera, Liriomyza, also known as leaf folder. Spring rape is heavier, often causing leaves to fall early, affecting scabs and resulting in reduced yields. In severe cases, plants withered and died.
First, living habits. The worms can occur in the province for 8-13 generations in 1 year in the province. Overwintering occurs in the winter through overwintering, adults in the overwintering period endanger rape in March, and adult worms of the 1st and 2nd generations occur in April. Before and after the end of April, rape blossoms were the most affected. In late spring and early summer, due to the temperature and the function of some parasitic bees, the amount of insects in the field decreased sharply. After August, the temperature dropped and the insect population gradually increased. Adults are active, active during the day and smoke nectar. There is a tendency toward sweet juice, and there are more young leaves. The eggs produced were gray spots with 1 egg per site. Adults like to choose tall, dense plants for spawning. As a result, tall rape plants are heavier. Adults and larvae are suitable for survival at a temperature of 15-20°C and cannot survive at temperatures exceeding 35°C. Therefore, during the high temperature season, the host grows in the shade and spends most of the summer.
Second, control methods
1, agricultural control. In early spring, timely elimination of weeds in fields and fields, and picking rapeseeds and leaves to reduce the source of insects.
2, trapping and killing adults. Adults can use 3% brown sugar liquid or sweet potato, carrot juice boiled liquid plus 0.5% trichlorfon to make poisonous sugar liquid, spraying in the field. And depending on the situation of insects sprayed every 3-5 days, even spray 2-3 times, you can kill the adult.
3, chemical control. In order to control the growth period of adults or the larvae, they can use 40% dimethoate EC, 50% malathion EC, 90% trichlorfon, etc. Each 1000 times solution, optionally sprayed. Can also be used 2.5% trichlorfon powder sprayed 2-2.5 kilograms per acre, pest control every 7-10 days 1 times. A total of 2-3 times prevention and treatment can achieve significant results.
First, living habits. The worms can occur in the province for 8-13 generations in 1 year in the province. Overwintering occurs in the winter through overwintering, adults in the overwintering period endanger rape in March, and adult worms of the 1st and 2nd generations occur in April. Before and after the end of April, rape blossoms were the most affected. In late spring and early summer, due to the temperature and the function of some parasitic bees, the amount of insects in the field decreased sharply. After August, the temperature dropped and the insect population gradually increased. Adults are active, active during the day and smoke nectar. There is a tendency toward sweet juice, and there are more young leaves. The eggs produced were gray spots with 1 egg per site. Adults like to choose tall, dense plants for spawning. As a result, tall rape plants are heavier. Adults and larvae are suitable for survival at a temperature of 15-20°C and cannot survive at temperatures exceeding 35°C. Therefore, during the high temperature season, the host grows in the shade and spends most of the summer.
Second, control methods
1, agricultural control. In early spring, timely elimination of weeds in fields and fields, and picking rapeseeds and leaves to reduce the source of insects.
2, trapping and killing adults. Adults can use 3% brown sugar liquid or sweet potato, carrot juice boiled liquid plus 0.5% trichlorfon to make poisonous sugar liquid, spraying in the field. And depending on the situation of insects sprayed every 3-5 days, even spray 2-3 times, you can kill the adult.
3, chemical control. In order to control the growth period of adults or the larvae, they can use 40% dimethoate EC, 50% malathion EC, 90% trichlorfon, etc. Each 1000 times solution, optionally sprayed. Can also be used 2.5% trichlorfon powder sprayed 2-2.5 kilograms per acre, pest control every 7-10 days 1 times. A total of 2-3 times prevention and treatment can achieve significant results.
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