The types of underground pests are mainly crickets, cockroaches, golden needleworms, ground tigers, and ploughing, etc. The following types of crops are often endangered in production: First, gramineous crops, mainly corn, rice, and millet, such as alfalfa bite the roots of seedlings. In a mess, it also "strings" strings of ridges and rows of rice, causing the seedlings to separate from the soil, causing the crops to perish in a row or a section, resulting in the lack of seedlings and ridges; and secondly, the peanut fruits and the sweet potato tubers, causing the peanut shells. The third is the harm caused by the new underground pests, such as the ploughing of sunflower pods, occurred last year in the corn fields of Xinglongshan Village, Toudao Town, Chengde County. The nymphs clustered on corn seedlings. The sap is sucked around the root of the root section or sheath, causing the affected plants to become thin and weak, and the leaves turn yellow. The growth retardation even causes the plants to die.
According to the living habits and damage characteristics of these underground pests, the following preventive measures must be taken:
First, seed dressing. The 50% phoxim EC was seeded with 0.1%-0.2% of seed weight. The method is to first dilute the medicine with a small amount of water, usually 50 kg of seed to 5 kg of dilute solution, spray the liquid onto the seed, spray while mixing, and then boring for 2 hours to dry the seed, or use 48% The emulsifiable concentrate is seeded at 5‰-7‰.
The second is physical removal of insects. Using the phototaxis of golden needleworms, cockroaches, and scarabs, traps are trapped in their excavation period each year from April to August. Cornfields are used for the control of tigers in the ground. Weeds should be removed from fields and fields to reduce spawning sites. Prevention and control of cultivating sunflower mealybugs should be carried out in a proper rotation to destroy the habitat suitable for the pests, strengthen field management, timely planting, timely cultivating and cultivating crops, so that the soil is loose, and the locust is good, and the host disease resistance is improved, since the worm is mainly concentrated in the crops. The roots are injurious. Therefore, the roots of crops should be ploughed and buried in time or taken out of the field in time to reduce the initial source of the insects in the field.
The third is the drug during the growth period. After the seedling period of maize after returning green, 50% thiophosphoryl emulsifiable concentrate 250-300 ml, with the water into the Tanaka. Can also be used for toxic soil, 50% phoxim EC 10 times 200-250 ml plus fine soil 25-30 kilograms made of medicinal soil, in the evening ridge ridge application, after the shallow earthworm mixed soil.
The fourth is poison bait trapping. Use 9% crystal trichlorfon 30 times, stir fry the wheat bran, add cabbage leaves, spread around the plant in the evening.
Fifth, the ground spray. Use ground tigers aged between 1-3 years to expose the surface and spray liquids, such as 40% acephate 1000 times.
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