According to a recent survey, there are 10 to 20 head larvae of large-scale mosquitoes in the general plot, and some serious plots can reach 87 heads/m2. The pests endanger various crops such as cotton, wheat, watermelon and cucumber. It mainly occurs in cotton fields and watermelon fields where organic fertilizers have been applied. The amount of insects in the plots varies greatly. Remind the broad masses of farmers to take note of the field and take precautions as soon as possible. First, the morphological characteristics Macrophaga is Diptera, Copticidae. Adults are 15-25 mm in length and 40-50 mm in wingspan. Larvae body length 10-30 mm; no foot; dark gray body, multiple horizontal folds, dull surface, bristles; no obvious head, head black, stimulated to retract into the body; tail back two pairs of growth The tentacles have two eye-shaped spots underneath, and a pair of feet below the tail, which can be retracted after touching. Spawning in the soil, eggs black, oval, diameter 0.2 mm. Second, the hazard characteristics The larvae hide in 2-4 centimeters of wet soil during the day. The larvae damage the seed buds and seedling rhizomes of the plants in the ground. They prefer to be wet, sooner or later and rainy days. The larvae drilled the surface to damage the petioles and young leaves of the plants. The use of unpatched chicken manure, sheep manure and other organic fertilizer land mass, pests, heavy damage. Third, prevention and control measures For the larvae hidden hazards in the soil habits, can be taken to prevent seed dressing, trapping and other methods. 1. Bait prevention. When the larvae begin to infest, 48% chlorpyrifos EC 200ml or 90% trichlorfon 250g mixed wheat bran was used as bait to spread to the surface in the evening to trap and kill larvae. Be careful not to sprinkle on the plants. 2. Spray control. After the emergence of cotton, 48% chlorpyrifos EC 2500 times or pyrethroid pesticides were sprayed one by one. Pay attention to loosen the nozzle when spraying, increase the droplets, so that the liquid along the stem into the root soil, play a role in the root. 3. Toxic soil. When the larvae are harmed, chlorpyrifos, phoxim and other agents or toxic soils are spread on the soil surface, and then cultivators are used to mix the pesticides in the soil to kill pests. 4. Chemical seed dressing. Macrobranchs are severely damaged and they are seeded with insecticides before sowing of crops such as cotton. Welcome select Beautiful European & caucasian sex dolls of CKSex doll. These life-size European sex dolls offer bodacious bodily assets, soft white skin or tan skin, and stunning European features that will be sure to fulfill your fantasy. With a configurable skeleton that allows them to act easily to your positions and maintain the posture without rebounding, our European sex dolls are designed with your carnal pleasure in mind. Realistic European Sex Doll,European Sex Dolls,European Sex Love Doll,European Love Doll Dongguan Chenkuang Biological Technology Co., Ltd , https://www.cksexdoll.com