Peanut new black ground spider mite is a new type of underground pest on peanuts and it is one of the pest quarantine objects of oil crops. In recent years, there has been an increase in the area where peanuts are planted. In particular, some heavy-duty plots have been more serious. Because it is endangered by the larvae attached to the roots, the body shape is small, the shape of rhizobia, is often mistaken for rhizobia, coupled with no experience, lack of prevention and control technology, causing some economic losses to farmers, and some even no harvest.
First, the harm symptoms
After the peanuts were harmed by the new black ground spider mites, the aboveground parts showed: the plants grew slowly, the plants were dwarf, the edges of the leaves were yellow, like water shortage and lack of fertilizer, and they died slowly in severe cases; the underground part showed: underdeveloped roots, decreased lateral roots, even Decay, little fruit and thin fruit.
Second, control methods
1. Reasonable rotations should be carried out in rotation with non-host crops such as corn, wheat and melons.
2. When the peanuts are harvested and site-scraped, the spiders are picked up promptly and destroyed centrally to reduce the number of insects.
In the middle and late 3.6 months, the middle of the egg was in time for cultivating, mechanical destruction of the egg chamber, reducing the hatching rate of eggs. Or use 3 kg of phoxim, worms, and chlorpyrifos to dilute 150 times with sand and sprinkle with water in the ditch.
At the peak of early egg hatching in early April, the roots were irrigated with 200-300 times of phoxim, chlorbenthos, and chlorpyrifos (note that the nozzles were removed), and 125 kg per mu were used.
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