In autumn, grape growth enters the stage of nutrient accumulation. Management should not be ignored, otherwise it will affect the flower bud differentiation and fruit setting in the coming year. Grape leafhoppers are the most severely damaged from September to October, often causing leaf fall and affecting the growth of grapes in the coming year.
Harm characteristics Grape leafhoppers are divided into grape leafhoppers and grape leafhoppers. In addition to harming grapes, they also cause damage to crops such as apples, pears, and kiwis. Leafhoppers gather on the back of leaves to suck leaf juice as adults and weak insects. The symptoms of damage begin with the lower leaves and inner chambers of the branches and vines, and gradually spread to the upper part and the outside. The leaves appear small gray spots, causing premature aging of the leaves, and then developing into the entire leaf surface, causing the leaves to lose water and scorch, causing early leaf fall, affecting leaf photosynthesis The function and the accumulation of organic matter in the tree body cause the ears to fail to develop normally, and the fruit is easy to wilt and fall off, which will affect the output of the current year and the next year.
Causes of pests 1. There are many grape leafhoppers, but in order to prevent and control pests, some fruit farmers do not hesitate to increase the amount and frequency of pesticide use, resulting in fewer natural enemies of leafhoppers and rapid reproduction of leafhoppers. 2. The vineyards are closed, poorly ventilated, and humid, causing many weeds in the vineyards and on the ground, creating favorable conditions for the growth and reproduction of leafhoppers. 3. Failure to clean up dead branches and leaves in time after fruit picking caused overwintering adults not to be eliminated in time, resulting in a large number of leafhoppers in the coming year. 4. In recent years, the spring temperature has risen rapidly, causing leafhoppers to occur early and for a long time. In autumn, the temperature is relatively high, and it is easy to survive the winter safely. Especially in rainy years, it is more conducive to the growth and breeding of the tikka, causing more damage.
Prevention
1. Strengthen the management of the growing period of grapes, cultivate frequently, pruning and pruning reasonably, topping in time, sorting out long branches, preventing concealment of orchards, and improving ventilation conditions.
2. After autumn, remove the rotten fruits, dead branches and leaves in the orchard in time, and burn them together.
3. Leafhoppers have a strong yellowing tendency. You can smear armyworm oil on both sides of the yellow board and hang it above the grape branches. The yellow boards are separated by 5 meters. Remove and replace in time when the insects are full.
4. Leafhoppers have a certain phototaxis and can be trapped and killed by hanging solar insect traps in the vineyard.
5. Protect and make good use of natural enemies, and use natural enemies to control grape leafhoppers to the limit.
6. Focus on the control of the first generation of larvae from May to June and the last generation of adults from September and October until the grape leaves fall. It can be used to spray meticulously with the wettable powder, fenvalerate EC, and Nongdile EC. The spray site is mainly on the back of the leaves, which has a good control effect on grape leafhoppers.
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