What should I do if the arborvitae tree turns yellow in August?

The reason why the oriental cypress turns yellow.

1. If it is a pesticide damage caused by herbicides, the pesticide damage is manifested as follows:

The yellowing of plant leaves caused by herbicide pesticide damage is generally large-scale, regular, and will not be hundreds of kilometers, only this intermittent dozens of meters There is a problem; In addition, the leaf wilt caused by pesticide damage is generally in patches, not to say that there are only one or two clusters of leaves on a plant; In addition, the yellowing time of leaves is relatively uniform, and generally after 7 to 15 days of herbicide use, it will show symptoms of pesticide damage.

2. If it is a cypress leaf withering caused by insect pests, the manifestations are as follows:

The insect pests that cause the dead leaves of cypress trees are mainly small silverfish, double cedar longhorn beetle, two kinds of dry borer pests, as well as underground pests such as grubs, which are caused by the cause of the pest The dead leaves of cypress trees are generally first manifested as the growth of the whole tree begins to weaken, the leaves are white and dull, and then they are withered and yellow.

However, after the damage of dry boring pests, there will be obvious wormholes on the trunk, or there are sawdust poured out; When infested by underground pests, the larvae of underground pests can be dug directly in the soil layer.

Therefore, it is easier to find traces of pest damage caused by the dead leaves of cypress trees caused by insect pests.

After excavating several Arborvitae trees that were more dry, it was found that underground pests were indeed found in the soil, but there were not many pests to make the situation so bad.

3. If it is the dryness of Arborvitae caused by disease, the manifestations are as follows:

Generally speaking, there will be an obvious center of disease caused by the dry of Arborvitae orientalis, for example, only a few meters or more than ten meters within dozens of kilometers, and if you do not use pesticides in time to prevent and control, it will continue to spread to the surrounding healthy plants; Or only a few leaves in a plant dry up at first, and then slowly infected until the entire canopy of the tree dries out. Most of these symptoms are caused by diseases.

To sum up: combined with the symptoms of cypress dryness caused by the above reasons, combined with the phenomenon of large area of dead leaves in the greening of highways in the area, the damage of underground pests is part of the cause, but the greater reason should be caused by the disease damage.

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The yellowing of the bonsai leaves of the oriental cypress is usually caused by poor light and root rot. If the maintenance environment is too dark, the leaves will turn yellow, should.

When the pine and cypress are cultivated, the leaves often appear yellow, which requires a good grasp of the habits of the pine and cypress, and then take good care of it, in order to prevent the yellow leaves. When the pine and cypress first grow pine needles, the color is slightly pale yellow, which is normal, and it will slowly become more and more green in the later growth process. What to do if the leaves of the pine and cypress trees are yellow, let's talk about it specifically.

1.Soil acidity.

Pines and cypresses prefer loose and fertile acidic soils, and alkaline soils cannot be used to breed pines and cypresses, otherwise the leaves will turn yellow, and the plants will grow slowly or even wilt.

2.Breathability.

You can choose a pot with good air permeability for cultivating pines and cypresses, and put some gravel or old rubble on the bottom of the pot to enhance the drainage function of the soil. The preparation of cultivation soil can mix loess and river sand evenly according to the ratio of 5:5, enhance the air permeability of the soil, and facilitate the growth of pines and cypresses.

3.Watering wisely.

Lack of pines and cypresses or excessive watering will cause the leaves to wither and yellow, you can see dry watering, rather dry than wet, do not accumulate water. If it grows in moist soil for a long time, the leaves of the pine and cypress will gradually turn yellow. After overwatering, pour out the flower pot to pour out the excess water and place it in a well-ventilated place to promote the rapid evaporation of water in the soil.

4.Proper fertilization.

The requirements for fertility of pine stool and cypress are not particularly high, and the appropriate amount of base fertilizer can be added when planting, and then fertilized again after 2-3 years of breeding, excessive topdressing will make the leaves of pine and cypress yellow and dry. After excessive fertilization, it can be properly watered to dilute the fertility in the soil.

5.Pest.

Pine and cypress will rarely be infected with pests and diseases, if the leaves appear yellow, you can observe whether it is sick, spray drugs in time to prevent and control, and use sterilized pruning to cut off dead leaves, diseased and weak branches, and promote the germination of new branches.