How to cure the insects on the elm tree now, the symptoms are falling sawdust and flowing liquid

The longhorn beetle mainly feeds on larvae, lives the longest, and causes the most serious damage to the trunk. When the eggs hatch out of the larvae, the first instar larvae are bored into the trunk of the tree, initially feed under the bark, and after the inage increases, they burrow into the xylem for damage, and some species only stay under the bark to live, not into the xylem. The larvae move within the trunk of the tree, and the shape and length of the moth-eating tunnels vary from species to species.

The larvae feed on the trunk or branches, opening their mouths into the bark at a certain distance as vents, pushing out excrement and wood chips. It eats on the trunk and branches, affects the growth and development of the tree, weakens the tree, leads to the invasion of germs, and is also easy to be broken by the wind. When the damage is severe, the whole plant dies, the wood is bored, and the process value is lost.

Prevention and control methods: 1. Artificial hunting. Depending on the wounds or grooves of the adult worms when they lay their eggs, the eggs are stabbed or stoned to death with a knife or hammer, and the larvae are hooked out with a wire to catch the adults.

2. Chemical control. The application of green Weilei to control the adult longhorn beetle, spraying 200-300 times of green Weilei on the trunk or large side branches before the beginning of the emergence of the adult longhorn beetle.

3. Trunk perforation and injection control. For trees with tall canopies and difficult spray control, 40% dimethoate stock solution and 20% imidacloprid can be used to control the adults and larvae of longhorn beetle. Method:

Dig an oblique hole deep into the xylem at a distance of 30 cm from the ground in the trunk, and the dosage is generally milliliter cm DBH. It can also be injected directly from the fecal discharge hole.

4. The swab controls the larvae of the longhorn beetle. When used during the damage period of longhorn beetle larvae, try to insert the swab into the fresh fecal hole and seal it with mud.

Half a catty of brown sugar, 3 catties of boiling water, it depends on what kind of bugs, and this is generally good.

1 Light booby-trapping: Adult feathers are booby-trapped by black light during the grinding period. 2 Artificial control:

Combined with the maintenance and management of egg mass removal and the centralized elimination of hatching cluster larvae, the overwintering larvae and overwintering insect cocoons were eliminated. 3. Biological control: protect and use the reputation of earth bees, wasps, sparrows, etc. to detect and fight enemies.

Release red-eyed wasps at the egg stage of the green-tailed silkworm moth with a parasitic rate of 60% to 70% Spray 1500 to 2000 times of 25% larval uret No. 3 suspension at the young larval stage for control, and spray 400 to 600 times of Emulsion containing more than 10 billion spores per milliliter of Bacillus thuringiensis (BT) at the advanced larval stage. 4. Chemical control: spray 2500 to 3000 times of 20% emulsifiable concentrate or 20% emulsifiable concentrate 2000 times of 20% pyrethrin emulsifiable concentrate at the peak stage of larval.

The following is a repost of an article, which may be useful: Beijing TV report (live broadcast Beijing): Summer is the high incidence period of tree diseases and insect pests, and the residents who live in the No. 13 courtyard of Qianbang Hutong have been plagued by insect pests these days.

In the No. 13 courtyard of Qianjiaobang Hutong, a tall elm tree with a diameter of about half a meter grows in the narrow corridor. If you look closer, you can see that the trunk of the tree is densely crawled with countless insects the size of little fingers, all of which are dark red and have hard shells like beetles. The insects crawled everywhere and fell down from time to time, and the residents said that the insects began to disturb the people as early as around the Spring Festival.

At first, it was quite small, crawling in through the screen window. Walk after the light, on the ceiling. Mr. Shi, a resident, said that after the Spring Festival, the insects were quiet for a while, but when it was hot, they began to move again, and they were even more noisy than during the Spring Festival.

Crawling everywhere, I didn't dare to open the door, and I swept the house three or four times a day. Mr. Shi pointed out the insects on his windowsill to us, and then swept the ones on the ground and windowsills. That's all there is to the house.

Mr. Shi said that more than 50 years ago, when his family lived here, this tree has been there, and I heard the elders say that the elm tree grows slowly, and it has grown to such a thickness for about 100 years, but this old tree is old and insect, and the medicine has not had much effect, which is really annoying. What kind of insect is this, how can they be cured, the reporter caught a few of them, and went to consult experts. It's called a straw sandal scale.

Around the Spring Festival, it becomes a small insect and climbs up the tree, and now the insect is big, and it has to go down the tree to lay eggs. These are the two most disturbing times. Professor Ann told us that the straw shoe scale is widely distributed across the country, and more than 100 species of trees can breed because the insect sucks the sap of the tree, so it affects the growth of the tree.

But now at this stage, the effect of spraying is not very good, and the better prevention and control period should be around the Spring Festival. The sheath of the tree was scraped off a little and taped so that the little bugs could not climb on it. Under the guidance of experts, we found a tree that used duct tape to control straw shoe scales, and sure enough, there was no trace of insects on the tree.

Experts tell us that the larvae of the trees covered in tape cannot climb up and stick to the tape, and this method has no effect on the trees themselves. Later, the reporter told the residents of No. 13 that this method was told to prepare early in the coming year to avoid the interference of the insect plague.

Elm trees are often infested with pests. Common elm pests include red spiders, elm oyster scales, and cotton scales. After the elm tree is invaded by red spiders, the leaves are gray and dry, and the leaves can be seen to erode into a web under sunlight.

When the elm scale insect infests the elm tree, the elm branches will be covered with white filaments, and the branches will become thinner and dryer. If left uncontrolled for a long time, the entire branch will wither. Another common ailment is sunburn.

When exposed to strong sunlight, elm bark can easily be scorched. Proper bark protection is the main way to prevent this disease.