Pine wood nematode disease is known as the "cancer" of pine trees, is recognized as the most devastating pine disease in the world, pine wood nematode itself does not have the ability to spread, in the current cognition of human transmission and natural transmission of the two ways, are inseparable from the "phantom" of pine brown tianniu, it can be said that pine brown tianniu is the most deadly spreader of pine wood nematode disease, control the pine brown nematode on the pine tree, you can control the spread of pine wood nematode disease.
<h1>Introduction to pine brown tianniu</h1>
Pine brown tianniu larvae
Pine brown tianniu is a completely metamorphosed pest of the tianniu family, which undergoes four stages: eggs, larvae, pupae, and adult insects. The eggs of the pine brown celestial cow are milky white sickle-shaped, about 4 mm long; the larvae are flattened cylindrical, milky white, up to 4 cm long; the pupae are 2-3 cm long, milky white; the adults are orange-yellow to reddish brown, 2-3 cm long, with long antennae, and have weak rotational light.
Pine brown tianniu overwinters in the body of the tree in the form of larvae, feathers adults in April-May of the following year, eats the young branches and bark of pine trees, and harms pine trees; adults mature and lay eggs in the shallow holes of the bark of the pest, and the eggs hatch into larvae and continue to moth under the bark of the pine trees, damaging the transport tissue of the trees, and after the autumn, the moth hole enters the xylem of the pine tree for overwintering, and so on, and so on, and the parasitic pine trees continue to migrate after they die.
<h1>Introduction to the control methods of pine brown cattle</h1>
According to the life rules of the pine brown tianniu and the situation of natural enemies, the following five methods can usually be used for effective prevention and control.
1. Hang a trap to trap
Pine brown tianniu trapper
Taking advantage of the weak rotational rotation of the adult pine brown tianniu, at the peak of the adult activity of the pine brown tianniu, that is, from May to September of each year, a special trap is used to hang it in the pine forest to trap and kill the adult pine brown tianniu.
2. Set up a trap to kill
Burn the lure wood
Taking advantage of the characteristics of pine brown tianniu like to harm weak trees (the strong ability of pine trees to secrete pine fat, pine brown tianniu is difficult to harm, so the general pine brown tianniu is for the harm of the forest stand of pine caterpillars), select the thin pine tree in the forest stand as a lure, use the special lure agent of the pine brown tianniu to inject the lure wood, do the temptation treatment, tempt the pine brown tianniu as a pest lure wood, until the end of the spawning period of the pine brown tianniu in October, cut down the trap, burn the lure, kill the pine brown tianniu inside the lure.
Third, chemical control
chemical control
During the feathering period of pine brown tianniu, that is, from May to June of each year, the control area is sprayed with high-efficiency, low-toxicity, broad-spectrum, low-residue, pollution-free 1% thiamethoxine microcapsule powder to kill pine brown tianniu.
4. Biological control
Release swollen-legged bees
Biological control is mainly to release the natural enemies of the pine brown throng in the control area and treat insects with insects. Releasable natural enemies of the pine brown tianniu include the tube-brown swollen-legged bee, the Sichuan scleroderm swollen-legged bee, the spotted flower velvet beetle eggs, or adult worms. Generally, the larvae of the pine brown tianniu release the swollen-legged wasp and the Sichuan hard-skinned swollen-legged bee at the 2nd instar, and release the spotted velvet parasite eggs or adult insects at 3-4 years of age.
5. Injection of drugs to protect prevention and control
Injection protection is generally aimed at rare and protected pine trees, such as pine ancient trees
Inject the drug for protection
Passive conservation measures are usually taken by drilling holes in the trunks of protected pine trees and injecting them with methylvidine salts from October to March of each year before the sap flows from the trees. Avermectin and other insecticides, to prevent the killing of pine brown cattle as a pest, many tourist areas, protected areas of the ancient trees, such as Huangshan Yingke pine, Jiuhuashan pine are strictly protected in this way.
There are more control methods of pine brown cattle, but in reality, the operability is not strong, the difficulty of prevention and control is still relatively large, especially the collective mountain farms are contracted to households, centralized prevention and control is difficult to achieve, as a forester, look forward to a simpler and more convenient control method, can effectively control the harm of pine brown cattle, curb the spread of pine wood nematode disease.