The big green leafhopper can also be called the green leaf flea, the green leafhopper, the big green floating dust, and the leaves and stems of various fruit trees and plants such as apples, pears, peaches, plums, apricots, walnuts, willows and poplars. It is fading, deformity, necrosis or withering, and can also infect poisonous diseases. Therefore, it is necessary to carry out comprehensive prevention and control in prevention and control, so as to effectively eliminate or prevent the control of the big green leafhopper, and then Xiaobian said that the disease symptoms of the big green leafhopper And integrated control measures.
1 harmful symptoms
The saplings of the leaves and stems and leaves of the host plants are irritated by adults and nymphs. In the fruit trees, the adults are mainly responsible for laying eggs. When the adult lays eggs in the late autumn, the surface of the branches will be pierced with a saw-like ovipositor, which will be crescent-shaped, and 6 to 12 eggs will be produced. When the adult density is high, the branches will be bruised and bruised, which may lead to pumping. The young tree died.
2 morphological characteristics
The adult larvae are 7 to 10 mm long, with a yellow-brown head, dark brown eyes, and a hairy horn. The front wings are green, the tips are transparent, and the hind wings are black. They are folded under the fore wings and the belly of the body is brownish yellow. The eggs are long ovate, about 1.6 mm long, and are arranged in egg pieces by about 10 grains.
3 occurrence law
Daqing eucalyptus occurs 3 generations in 1 year, and the eggs are overwintered under the epidermis of apple branches or seedlings. They hatch in the second year of April, and the nymphs after hatching begin to transfer crops and weeds for food intake after 1 hour. The third generation nymphs endangered late autumn crops and vegetables. By the end of September, the third generation of adults flew to the autumn vegetable field. In October, they began to fly to the orchard, and the eggs were produced on the young and smooth branches of the fruit trees and the young trunks. When the orchard is used as a juicy late-maturing crop such as cabbage, radish, and potato, or when these late autumn crops are planted around the orchard, the fruit trees are seriously damaged.
4 prevention and control technology
4.1 Reasonable intercropping
Young fruit trees and gardens avoid intercropping late autumn crops, such as cabbage, radish, carrots, potatoes, etc.; after the fall, we clear the weeds in the garden, control the amount of aphids and the weeds around the orchard and late autumn crops.
4.2 Brushing agent
In the middle of October, before the adults moved to the orchard to lay eggs, the saplings were painted with white paint to prevent the adults from laying eggs. The white paint formulation was: 10 kg of quicklime, 0.5 kg of sulfur powder, 0.25 kg of salt, animal oil or skin. Appropriate amount of glue, use a proper amount of water to make a paste, apply dry, branches, and prevent adults from laying eggs.
4.3 Light traps adult
From September to October, black light is placed outside the orchard to trap adult insects.
4.4 wrapping paper or plastic tape
Wrap paper or plastic tape on the young branches to prevent water loss and prevent the green leaves from spawning.
4.5 Spray control
In the young orchard, when the female adult is transferred to the tree for spawning in October, spray 45% to 48% (mass fraction, followed by the same) chlorpyrifos EC 1 200 to 1500 times, or 20% pyrethroid EC 2 000. Double liquid, or 10% cypermethrin EC 2 000 times liquid or 90% trichlorfon crystals, etc., usually sprayed once every 7-10 days, continuously spraying 2-3 times.
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