Pest and disease control of sweet olive

Powdery mildew on Osmanthus fragrans

Powdery mildew damage

The leaves are often covered with white powder on the front and back, causing the leaves to lose their green color, turn yellow, and fall off, which is very harmful during the growth of new shoots. The disease is prone to occur and spread rapidly when there is a lot of rain and high humidity.

Prevention and treatment methods

During the growth period of new shoots or just when they sprout, spray the new shoots and leaves once with 1200 times diluted amylopectin aqueous solution, 800 times diluted chlorpyrifos aqueous solution, or 1000 times diluted white powder aqueous solution, etc., and evenly wet all the leaves and branches. When there is a lot of rain and high humidity, spray 800 times thiophanate-methyl aqueous solution once on a sunny day. For example, if you have a potted thyme at home, you can spray 25 to 30 times the amount of dry, pure wood ash extract on the leaves. If it rains 4 hours after spraying, you should spray again to improve the control effect.

Red spider appears on the sweet olive

Red spider mites

It harms the leaves, attaches itself to the leaves and sucks juice, causing the plants to be malnourished, causing the leaves to lose their green color and turn yellow, leading to massive leaf fall. It is easy to occur in high temperature and drought, so pay attention to check the leaves.

Prevention and treatment methods

When you find red insects the size of needles crawling on the leaf surface or back of the leaves, spray 800 times of 20% trichlorodicofol or 800 times of 40% dimethoate emulsion continuously. Repeat 2 to 3 times and the effect will be remarkable.

Longicorn beetle appears on the branch of the sweet olive

Longhorn beetle damage

It harms branches and twigs, bores into the epidermis, forms tunnels, weakens the tree, and in severe cases breaks branches and twigs, or even kills the tree.

Prevention and treatment methods

During the growing season of thyme, you should pay attention to regularly check the branches and twigs. If you find insect feces, you should find the insect holes, then use cotton dipped in DDT solution to block the holes, so that the branch beetles will be suffocated to death in the worm tunnel. During the egg-laying and hatching season of branch beetles, usually in autumn, spray 1000 times liquid solution of Tosabun on the branches and twigs every 7 to 10 days. Spray 2 to 3 times in a row to kill the eggs and newly hatched larvae.

Scarab beetles appear on the sweet olive tree

Scarab beetle damage

The damage is mainly to the leaves, mainly by gnawing on the tender leaves, which reduces the number of leaves, weakens the tree and affects its normal growth.

Prevention and treatment methods

During the growth period of young leaves, you can spray 800 times dichlorvos aqueous solution once for prevention and control. During the peak period of larval occurrence in early June and early to mid-July, irrigate the roots with 1500-2000 times diluted 40% methyl phoxim, once every 7-10 days, and irrigate continuously for 2-3 times. It can effectively prevent and control larvae during the growth and development period of seedlings, and can also reduce the damage caused by insect pests in the next year.

Leaf rollers appear on the sweet olive

It harms tender leaves, causing them to curl and die, or causes the growing points to shrink and stop growing, affecting the normal growth of the leaves.

Prevention and treatment methods

During the growth period of young leaves, you can spray a 1500-fold solution of Aphid Cleaner, or a 1500-fold solution of Dagongchen, or a 1500-fold solution of Anlubao for prevention and control until the larvae are killed.

Aphids appear on the sweet olive

Aphid damage

They usually concentrate on sucking sap from tender buds, leaves and branches, causing the affected parts of the plant to shrink and deform. Aphids also secrete honeydew that contaminates the plants and induces diseases such as sooty mold.

Prevention and treatment methods

You can use 400-600 times diluted Supusha or 400-600 times diluted Wanling for spraying once every 7-10 days, and spray 2-3 times continuously, the effect is significant.