The celestial cow is the toy of our childhood, but it is also the hatred of the growers. The larvae of the celestial cow eat the trunk and branches, affect the growth and development of the tree, weaken the tree, lead to the invasion of germs, and are easily broken by the wind, and when the damage is serious, the whole plant dies. Some adult tianniu can also eat the epidermis of branches, causing harm to fruit trees.
The larvae of the elderly Tianniu enter the xylem as a pest
In the lifetime of Tianniu, tianniu larvae have the longest survival time (up to more than 8 months) in the tree body, and the most serious harm to fruit trees. The female bites through the bark with her palate to form grooves before laying eggs, and then lays one egg (and many more) in each slot. When the eggs hatch out of the larvae, the young larvae feed under the bark, and when they are older, they burrow into the xylem as a pest, and the larvae move in the trunk, opening the bark at intervals as ventilation holes, pushing out excrement and wood chips outward.
The celestial bull is nibbling on the skin of a citrus branch
Physical control
1. Hunting adult insects: For tianniu with pseudo-death or dry-based habitat characteristics, artificial shock fall can be used to hunt or directly kill.
2. Eliminate larvae: manually hammer the eggs and peel off the bark to kill the larvae.
Tianniu larvae moths eat holes
3. Whitening of the trunk: The trunk of the tree 1.5-2 meters from the ground is whitened to prevent the tianniu from laying eggs. If there is a shear and saw on the fruit tree, it is also necessary to apply protective agents (varnish, etc.) in time to prevent the tianniu from laying eggs.
4. Enticing booby traps: For some adults of Tianniu (such as: peach-necked Tianniu) with sweet and sour properties, sweet and sour liquor can be artificially prepared (sugar: vinegar: wine is 1:0.5:1.5), and insecticides (such as enemy insects, etc.) can be added to trap and kill.
Whitening of the branches prevents the cattle from spawning
Biocontrol
The Celestial Bull has many predatory and parasitic predators, and the swollen-legged wasp is one of them. Swollen-legged wasps can find larvae and pupae along the worm path and lay eggs in the larvae or pupae. After hatching, the eggs of the swollen-legged bee absorb the nutrients of the tianniu larvae and pupae and cause their death, so as to achieve the effect of prevention and control. In addition to the swollen-legged bees, there are also flower-sized parasitic nails, white zombies and parasitic nematodes, which are currently commercialized and can be applied.
Release the Swollen Leg Bee, a natural enemy of the Celestial Bull
chemical control
1, adult pest control: in the peak period of larval feathering (adult out of the hole peak period of 6-7 months), the use of pyrethroids, chlorpyrifos, imidacloprid and other agents for prevention and control, 5-7 days spray garden once, spray site mainly to the branch cadres, each spray, so that the liquid flows along the trunk to the roots; or use the above agents to dry.
Adult light-beetle star tianniu and egg-laying slots
2, egg and young larval control: tianniu egg laying and young larval activities are under the epidermis of fruit trees, not harmful to xylem, at this time pay attention to let the sub-bark larvae or eggs contact the agent, kill eggs and young larvae.
In the peak period of egg laying and larval hatching of Tianniu (the peak of egg laying is generally in June to July), find egg laying grooves and larval hazards (check the tree surface wounds and borer holes), and use three methods of medicament application, poisonous cotton bandaging, and poisonous soil clay for prevention and control.
3. Pharmaceutical application: use insecticides such as permethrin and organophosphorus to add diesel or diesel oil for application;
4, poisonous cotton bandaging: the liquid medicine is sucked on the cotton bandage on the branch (scrape off the old skin first), and then wrapped with plastic film;
5. Poisonous soil clay: the medicinal liquid is mixed with an appropriate amount of clay to mix into medicinal soil, and the clay is applied to the egg laying and larval hazards.
The liquid medicine is injected into the worm passage to kill the larvae
6. Control of larvae in the moth: The elderly larvae enter the xylem as a pest, and the control is more difficult at this time. First, the moth holes for new excretion are found (the trunk and feces under the tree have been washed away after heavy rains, and the fresh excrement holes are easy to identify). If there are multiple fecal holes, the last hole should be selected, first dig out the fecal chips, stuff the drug into or inject into the moth (you can choose mothballs, gasoline, cotton with chemicals, etc.), and then seal the orifices with wet clay or wet yellow mud, check the effect after 7 to 10 days, and if there is a new fecal discharge hole, it should be remedied.
Summer is the peak of spawning and adult feeding. Although the Tianniu is small, the losses caused by it are huge. Therefore, in summer, fruit farmers should pay attention to timely prevention and control to avoid the harm of tianniu affecting the economic benefits of fruit farmers.
Article source: "Tinder Three Farmers"