Control techniques of Monochamus alternatus

Monochamus alternatus, also known as pine longicorn beetles, is the main trunk borer of pine trees, which occurs very commonly and seriously in the distribution area of pine trees, which not only kills pine trees, but also is the main transmission vector of pine wood nematode disease. doing a good job in the control of pine longicorn beetles is very important to protect pine resources and ecological environment. Let's take a look at the control techniques of pine longicorn beetles.

Domestic distribution

Pine brown longicorn beetles are distributed in Jiangsu, Anhui, Zhejiang, Jiangxi, Hunan, Fujian, Guangdong and other provinces in China, mainly to harm Pinus massoniana, followed by damage to fir, spruce, cedar, larch and other poor growth trees or newly felled trees, especially pine trees with weak growth caused by Dendrolimus punctatus, which invade in large numbers and easily cause pine trees to die.

Growth habit

Monochamus alternatus occurs one generation every year, overwintering as mature larvae in the xylem of the damaged tree trunk, and pupating in the pupa chamber at the end of the insect track in late March of the following year. In the middle of April, adults begin to Eclosion, bite feathering holes and fly out, nibbling on twigs and bark to replenish nutrition, and May is the peak period. Adults have phototaxis, and after sexual maturity, they bite into grooves at the base of the trunk or on the bark of thick branches, and then lay one or more eggs in them. The hatched larvae eat into the phloem, xylem and sapwood, forming irregular tunnels.

Prevention and cure method

1. Trap: hang the trap between two pine trees with wire, the lower end of which is about 1.3 meters from the ground. Place cotton in the core bottle, pour in the attractant, pour half a bucket of water into the trap, and fix it on the funnel neck with wire. The trap is mainly located in the forest where the air is more ventilated, with a distance of 100m to 150m. Observe every 3 days, clean the insect collector and change the attractant every 7 days.

2. Control of Beauveria bassiana: Beauveria bassiana has a strong pathogenicity to Monochamus alternatus. With the use of attractant, longicorn beetles gather on the pine trees around the cloth during Eclosion to feed on Beauveria bassiana wrapped in the trunk and infect other Monochamus alternatus, so as to achieve the purpose of killing adults of Monochamus alternatus.

3. Forest management and prevention.

① manual cleaning: timely felling and cleaning of dead trees, dying trees and seriously damaged diseases and insect pests in woodland, so as to prevent and monitor the reproduction of Monochamus alternatus.

② mountain closure for forest cultivation: strengthen mountain closure for forest cultivation, strictly control broad-leaved forest cutting, gradually change stand structure, directional cultivation of mixed forest, and improve the self-control ability of forest ecosystem.

③ to build mixed forest: strictly control the tending intensity of artificial forest, gradually transform the same age forest and large area pure forest into mixed forest and multi-layer forest, increase the species of natural enemies of Monochamus alternatus, and achieve ecological balance.

4. Chemical control

① spraying control: the trunk and crown of Monochamus alternatus were sprayed with green Weilai 750ml / ha in the adult stage, and the control was carried out in the early and heyday of emergence.

② trunk injection: ancient pine trees with special significance and pine trees in need of protection were protected during the emergence period of Monochamus alternatus, and 400ml / ha was injected into the base of the trunk.