Hazardous Characteristics Grape larvae attack larvae in vines and specialize in soft tissue in the pith to make it difficult or interrupt the upward transportation of water and nutrients, resulting in yellowing of the leaves, resulting in falling flowers and falling fruit. In severe cases, it can cause the growth of the damaged parts to stop growing. Or dry with death, the victim often grows like a tumor.

The law of occurrence occurs one year in a year, and larvae live in winter in grapevines. When the grape sprouts in spring, the overwintering larvae begin to move and continue to feed on the branches. In the end of March and early April, larvae begin to phlegm. Feathering occurs at the end of April and early May. Adults are hidden and nocturnal during the day and have phototaxis. Eggs are produced at the buds of new shoots. After hatching, the larvae invaded into the tender stem from the base of the new shoot petiole, harming the pith, excreting the insect feces, and accumulating near the fistula. The branches above the damaged area often die. From June to July, the young larvae mainly harmed the vines growing in the current year. From August to September, the older larvae mainly harmed the old vines more than two years old. The larvae had a large food intake and caused the most serious damage. The mature larvae gradually entered hibernation in October.

Prevention and control technology larvae are difficult to control after invading the vine, so it should be better to control the insects before and after spawning and egg hatching. Spray 25% diflubenzuron III suspension agent 2000 times or 20% diflubenzuron suspension agent 3000 times solution 1 or 2 times in a timely manner; pharmacy should spray evenly and spray thoroughly until the drug droplets do not flow, to eliminate Adults and eggs control the number of worms. For severely injured plants, the sap flow period (after injury stops), each main vine with 10 to 15 cm from the ground, drills 2 to 4 holes with deep vertebrae, and the depth reaches up to the medullary heart. The position of the hole should be Slightly downward to 40 to 50 degrees to allow the liquid to flow down and prevent sludge. Then, Omethoate (phosphorus, chlorpyrifos and other emulsifiable concentrates can be formulated into 10 to 20 times aqueous solution), and the medical syringe can be used to suck the solution and inject it into the wells. Each fluid can be used in 4 to 5 ml. Sealing with a tape immediately after liquid injection is better, and it can also be sealed with mud. When the pests have formed in the dendrite, injection method can also be used directly from the feces discharge hole injection, but the concentration of the agent should be about 100 times, after the injection of dressing can block play. For vineyards that are more harmful to larvae, use tweezers with cotton balls, dip-resistant dilute drugs 5 to 10 times, directly apply the damage, and then use plastic film to wrap, but also have insecticidal effect. Never use drugs before fruit harvest.

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