First, walnut limb moth 1. Injury symptoms. Walnut exhumation moth larvae into the walnut fruit inside and horizontal skewer damage, the victim's fruit gradually darkened, shrinking, so that a large number of fruit off, hence the name "black walnut." 2. Control measures. The first is to clear the worms, remove and pick up the fallen fruits at any time, and destroy them in a centralized manner so as to reduce the density of worms in the next year. The second is crown spraying. From the beginning of June to the end of July, spraying 25% diflubenzuron suspension agent 1500 times and adding 2.5% deltamethrin Emulsion 3000 times every 10 to 15 days, and spraying twice, the best effect. The third is the ground spraying. Spraying 50% phoxim EC on the ground around the trunk in early June will provide 300-500 times of fluid and 0.5 kg per mu, which will significantly reduce the damage of the next-generation larvae. Second, cloud beetles 1. Injury symptoms. Coleoptera is a family of cattle, alias Walnut big sky, iron bark. The larvae are harmed in the trunk of the borer, affecting the tree growth and reducing the quality of the wood. In severe cases, the trees will die. The worm occurs in 1 generation and spans 3 years in 2 years. The larvae and adults overwinter in the trunk. From early July to late July, the newly hatched larvae enter the peak period. 2. Control measures. One is manual killing. According to the behavior of Tianniu biting trough spawning, find the spawning trough and kill it with a hard object. When the trunk is inspected frequently and fresh dung is found, the larvae can be killed by gently picking the cortex off with a knife. The second is light trapping adult. According to the phototaxis of Longhorn, black light traps can be set. The third is blocking. When the rate of damaged plants is high and the density of insect populations is large, the system may use systemic medicaments to spray the damaged trunks. Use 80% of dichlorvos 500 times to inject into the fistula hole or dip tampon hole and seal the hole with mud. Or use pesticides such as deltamethrin to make poison sticks into the boreholes and kill the larvae.
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According to years of observation and investigation in the Walnut Garden, there are two main pests of the walnut trees in June and July. One is the walnut extremities moth, and the second is the clouded sky beetles. The symptoms and prevention measures of the two pests are described below: