Disease and Pest Control of Cotinus coggygria

Brown spot

The brown spot disease of Cotinus coggygria mainly requires controlling the appropriate environmental temperature, avoiding excessive cold or heat, to ensure its normal growth. If the disease is found, you can directly spray it with the corresponding fungicide.

Root-knot nematode disease

When it is cold in winter, the diseased seedlings with nodules can be dug out and frozen outdoors in the open air using the natural low temperature. If the disease is mild, you can directly cut off the nodular roots and soak them in 45℃ water for about five minutes. Use water temperature to kill the insects; if the disease is more serious, the nodular roots need to be completely destroyed, and add chlorpyrifos (250 grams/667 square meters) within 5-6 cm on the side of the root to prevent the spread of pests.

aphid

This situation is quite common. If it is not properly prevented and occurs, you can just use a special insecticide to deal with it. It is not very troublesome.

Underground pests

For pests lurking underground, you can usually irrigate the area around the roots of the seedlings with pesticide solution, such as 1000 times the solution of 50% chlorpyrifos emulsifiable concentrate. You can also use poisoned bait to lure and kill them, with the bait being wheat bran, soybean cake, cottonseed cake, corn kernels, etc. First, fry the bait until fragrant, then add in 30 times diluted 90% dichlorodiphenyltrichloroethane crystals and mix well. For every 30 crystals of the liquid, mix 1 kg of bait, add appropriate amount of clean water to wet it, and spread it in the evening.

Damping-off

Damping off disease requires strengthening the sanitation management of the garden, focusing on cleaning and pruning diseased branches in a timely manner. You can take 50% carbendazim solution, or 500-1000 times solution of 50% wettable powder, or 1:1:120 times solution of Bordeaux, and spray it once every 10-15 days.

powdery mildew

The main method to prevent and control powdery mildew is to spray with Baume-sulfur mixture before the branches sprout. You can also use 20% oxycarboxin or 800-1000 times solution of triadimefon and manganese zinc for spraying, both of which will achieve good results.

Fusarium Wilt

For Cotinus coggygria wilt, seriously diseased branches need to be dug out, burned and then buried in the soil to block the root cause; then use pentachloronitrobenzene to treat the soil. An appropriate amount of the liquid medicine can be mixed into the soil. After watering, the soil can be turned over again.