Recently, there are many small brown beetles the size of sesame seeds at home. Who knows what this is? ...

In terms of prevention and control measures, in order to facilitate encirclement and suppression, on the basis of pest investigation, it is first carried out from the periphery to the source of pests. Newly infected trees and weak trees are resolutely removed. Removing damaged trees is the first choice to eliminate moths.

1, cut down the damaged trees, reduce the harm of pests, and immediately cut down the severely damaged weak trees or dead trees for necessary pest control treatment.

Treatment methods: First, uproot the whole tree; The second is to remove the lateral branches and roots and burn them; The third is to cut the trunk into 3-meter-long blocks; The fourth is to dig a pit 1 m deep, 2 m wide and 4 m long; Fifth, put the trunk (segment) in and fumigate it with aluminum phosphide 3g/m3 (sealed with plastic film with a thickness of 0. 12mm) (3-5 days); Fifth, take out the tree segments, scrape off the bark and burn it.

2. Chemical control of trunk: For slightly damaged Pinus tabulaeformis, the method of spraying pesticides around the trunk and branches (from top to bottom) is adopted. The pesticide is a strong systemic agent such as 40% omethoate or toxic zinc, and a penetrating agent is added at the same time, and the concentration is 100-200 times. Spraying time is before 9: 00 am and after 5: 30 pm. Don't spray when it's windy and rainy, but do it at the same time. Do a good job of antivirus when spraying drugs.

Living habits

Life history and main habits: it breeds 1 generation every year, overwinters as adults and overwinters in different places in the north and south. In the south, adults overwinter in damaged branches. Overwintering adults leave the overwintering site from late March to mid-April of the following year, invade the pith of pine branches to supplement nutrition, and then build holes, mate and lay eggs on healthy treetops, weak trees or newly felled trees.

It was observed in Hangzhou that the eggs hatched in mid-April, and the larvae immediately ate after hatching, forming a tunnel. The tunnel is a single vertical pit, and the sapwood is slightly contacted under the bark. The length of the tunnel is generally 5~6 cm. Sub-tunnels are on both sides of the parent tunnel, perpendicular to the parent tunnel, long and curved, generally 10~ 15.

The larval stage is about 65438 0 months. In mid-May, the pupa room is located at the end of the sub-tunnel. From late May to early June, new adults appeared, and then invaded the new shoots to supplement nutrition. After the adults eat into the branches for a certain distance, they immediately quit and eat new holes. The number of holes invaded on the 1 branch can reach as many as 14.