Hou Bingshan, Qinghe County Garden Management Office of Hebei Province asked: In 2000, more than 300 plants of Acacia were planted in a main street in our county. Most of them have grown to a breast diameter of 20 cm, but about 20 of them die each year. We have taken a series of measures, such as the spraying of foliar trunks, the treatment of wilt disease by roots, the white ash around the base of the tree, and the prevention of infection, which will not help. What methods can be used to solve the problem of the death of Acacia in successive years?
Editor: After receiving a letter from Comrade Hou Bingshan, we asked Comrade Suo Yaozong of Beijing Beichen Group to answer.
Suo Yaozong: I didn't go to the scene. According to the description, there may be three reasons. The first is caused by the harm of dried insect pests; the second is Acacia; the third is caused by dry hot air in summer when the soil is insufficient in water.
The larvae are 3.5 to 4 mm long, and the larvae are 5 to 6 mm long when they are mature. The head is small, dark brown, and lacking. The first year of the Beijing area, the larvae spend the winter in the trunk of the victim. In the second half of May of the following year, the larvae are mature and phlegm in the tunnel. In early June, adults began to emerge, crawling on the bark, biting the leaves on the canopy, and laying eggs on the branches. The larvae sneak into the bark after hatching, so May to July is the main hazard period. From September to October, the dark brown gum came out of the victim, and the wormhole had worm droppings. The control method of chitin can be dried with 100 times of dimethoate or stock solution. It can also be used to block the wormhole with soil and mud, and then tape it to prevent drying. A method of drug injection can also be used.
If it is Acacia, if the soil is sticky, it should be improved. Water should be drained in time after the rain, and usually do not pay too much water to avoid the acacia.
If it is caused by dry hot air, spray more water in summer and prevent the soil from drying out.
In short, to find out the real cause, the right medicine, in order to solve the problem.
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