People often use "pine evergreen" to describe youth forever; use "pine crane longevity" to express good wishes for a long life; use "Shoubi Nanshan Bulao Pine" to compare longevity without boundaries, but all of this may be changed by this invasive pine destructive disease and pest, which is pine wood nematode disease.
<h1>Introduction to pine wood nematode disease</h1>
Pine wood nematode disease is a deadly disease and insect pest of pine trees caused by pine wood nematodes invading pine trees, parasitizing, multiplying and reproducing in pine trees, producing a series of physiological and biochemical effects, and finally causing pine trees to wither and die.
Once the pine tree is invaded by pine wood nematodes, it will die after 40 days of infection with pine wood nematode disease, the resin secretion of the infected pine tree is reduced at the beginning, the transpiration effect is weakened, the needles gradually lose green and become yellow-brown, and the pine resin secretion stops in the later stage, the needles all become yellow-brown and reddish brown, the hanging branches do not fall off, and the whole pine tree dies. Sawing open pine wood nematode disease disease, the cross section of the diseased wood has a distinct circular indigo halo, which is also one of the typical characteristics of pine wood nematode disease.
<h1>Pine wood nematode disease transmission route</h1>
The adult pine wood nematode is less than a millimeter long, difficult to identify with the naked eye, can only be observed with the help of a microscope, it is not contagious in itself, but it can be spread unbridled through the vector insect Pine Brown Tianniu (also known as Songmo Tianniu).
Usually, the natural migration of the pine brown tianniu carrying pine wood nematodes, or with the transportation of pine disease wood, pine tree disease wood products (pine brown tianniu lays eggs in pine trees) large-scale transfer, fly to healthy pine trees to eat, for the harm of pine trees, through biting wounds, the pine wood nematode spreads to the healthy pine body, pine wood nematodes in the pine trees in large numbers of reproduction; at the same time, after the pine brown cattle eat and supplement nutrition, they will also lay eggs on the damaged pine trees, multiply in large quantities, and after the adult insects are feathered, they will continue to carry a large number of pine wood nematodes around to harm the pine trees. Transmission of pine wood nematode disease.
If the infected wood infected with pine wood nematode disease is not strictly controlled, it will also be due to unauthorized logging, disorderly stacking, long-distance transportation, processing and utilization, wood product circulation and other ways, which will play a role in aiding and abetting the spread of pine wood nematode disease, fueling the waves, and adding fuel to the fire, increasing the transmission route of pine wood nematode disease and enlarging the spread speed of pine wood nematode disease.
<h1>Principles for the disposal of pine wood nematode disease infested wood</h1>
Therefore, the prevention and control of pine nematode disease, in addition to killing the direct pest pine wood nematodes and vector pest pine brown tianniu, the disposal of pine wood nematode disease is directly related to the prevention and control effect of pine wood nematode disease, which is an important link in the prevention and control of pine wood nematode disease.
For pine wood nematode disease disease, the strategy of timely removal, timely crushing or burning is usually adopted to carry out harmless treatment to completely kill pine wood nematodes and pine brown tianniu in the body of diseased wood trees.
Incineration can generally completely exterminate tree pests, the best effect; crushing can only kill pine brown cattle nymphs and adult insects, destroy the living environment of pine brown cattle eggs, and have a significant effect on controlling the spread of pine wood nematodes.
When crushing, it is necessary to exhaust the branches and roots of more than 1 cm, and cut into particles with a diameter of less than 1 cm, or slices with a thickness of less than 0.6 cm, and the roots that cannot be excavated must be covered with a steel wire mesh cover or thick plastic film to avoid the feathering of the remaining pine brown cattle.
According to the data released by the State Forestry and Grassland Administration, pine wood nematode disease has caused nearly one billion dead pine trees for more than 30 years, direct and indirect economic losses of hundreds of billions, at present, There are 18 provinces and 588 county-level administrative districts in China 9.74 million mu of pine wood nematode disease, and rapidly spread to the west and north, the harm objects from masson pine, black pine to korean pine, larch expansion, and break through the annual average temperature of 10 degrees is no longer harmful traditional theory, the situation is quite grim.
In November 2018, the State Forestry and Grassland Administration revised the "Technical Plan for the Prevention and Control of Pine Wood Nematode Disease" and the "Management Measures for Pine Wood Nematode Disease Epidemic Areas and Diseased Wood", which determined that in the future, the prevention and control of pine wood nematode disease should be based on the cleaning of diseased wood as the core and the management of diseased wood as the foundation, and more scientific, rigorous and practical control measures should be implemented to fundamentally curb the spread of pine wood nematode disease.
Therefore, once the pine tree is infected with this disease, the end can only be crushed bones or burned by fire, thorough and clean harmless treatment, to eliminate the spread of pine wood nematode disease.
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