After entering the autumn, when the author visited some apple producing areas, he discovered that many young orchards were affected by leafhoppers. The main species were Daqingyeye and Xiaolvye. In the growing season, leafhoppers mainly feed on vegetables and weeds, but they can also damage the leaves of fruit trees. Generally, the damage will not be serious. However, in autumn, especially in late autumn, Daqingye leafhoppers need to find places for wintering, mostly from vegetables and weeds. On the migration to the fruit tree, the fruit tree trunk becomes the focus of its damage. Therefore, after the fall, we must pay special attention to the changes in the number of leafhoppers in orchards and timely prevent and treat them. First, the symptoms of damage The big green leafhopper, also known as the big green dust, has a wide range of hosts, including crops, vegetables, trees, and fruit trees. Apple trees, pears, peaches, and grapes can all be affected. Damaged leaves in the growing season of fruit trees caused chlorotic spots on the surface of the leaves. Careful observation of needle-like holes in the center of the chlorotic spots was generally not serious. In the fall, the adults are searching for dry branches of fruit trees as wintering grounds. Adult ovipositor spawns the bark and places the eggs under the branches of the branches, resulting in half-moon wounds. When the damage is severe, the branches are dehydrated and dried up. Saplings and nursery stocks are easily dried by the wind after being victimized, and are prone to frost damage in winter. This is one of the incentives for young trees to “stokeâ€. Second, the law of occurrence The worm was born 3 generations a year, and the egg was wintered under the branches of fruit trees or seedlings. After the fruit tree is sprouted the next year, the eggs begin to hatch, and the nymphs migrate to the nearby weeds and vegetables. In the future, they are transferred to crops such as corn and sorghum. After late autumn, most of them were transferred to cabbages, radishes and other vegetable fields. In mid-to late October, the adult flies back to winter in the fruit trees. Third, control methods 1. Prevent adults from spawning. Before the adults came to the orchard in early October, the young trunks were painted with white paint to prevent females from spawning. The white paint formulation was: 10 kg of quicklime, 0.5 kg of sulfur powder, 0.2 kg of salt, and a small amount of animal oil, and transferred into a paste with water. For 1-2 years old young trees, plastic bags can be used to cover the young trees to prevent adults from spawning. 2. Note intercropping. Be careful not to make late autumn vegetables such as cabbage and radish in young orchards to reduce the occurrence of this worm. 3. Chemical control. In the autumn orchard with large amounts of worms, especially for 1-3 year old saplings, it is possible to spray 10% imidacloprid wettable powder 3000 times, and add 4.5% beta-cypermethrin EC 1500 times when it is found that adults fly to lay eggs. 2.5% Lambda-cyhalothrin EC 2500x, 20% Fenvalerate EC 2000x, and then spray once every 10 days. Yancheng Rongtai Labware Co.,Ltd , https://www.shtestlab.com
Autumn young orchard attention to prevention and treatment of leafhoppers