What are the common pests of azaleas? How to prevent and cure?

Common pests of azaleas are red spiders, military insects, aphids, short beard cochlea and so on. Red spiders are small in size, but they do serious harm to azaleas. Cuckoos raised in high-rise buildings are most prone to this kind of pest.

The method of prevention and control is to hunt and kill manually. Medicine can be used to kill insects with 5 degrees of stone sulfur mixture, or you can use walnut leaves, Yangzhu peach leaves, green poles and other parts to soak out the juice, dilute it with water and sprinkle it with ll, and it is also a good way to spray and kill with 1000 dichlorvos solution.

The adult body of the military worm is small and flat, about 4 mm long and black. It is the most serious pest to the evergreen rhododendron. It often sucks leaf juice behind the leaves, and yellow and white spots appear on the leaves of the injured area, causing the leaves to fall off, causing the tree to weaken and affecting growth and flowering. This insect is easy to occur in rhododendrons in greenhouses.

The main method of prevention and treatment is to spray and kill with medicine. It can be sprayed with 1000 times of 90% trichlorfon or 1500 times of 40% omethoate EC or 1000-1500 times of fenitrothion emulsion.

Aphids mainly harm the young branches and leaves of rhododendron, light ones can make the leaves lose green, heavy ones make the leaves curl, become hard and brittle, can not absorb nutrients and affect flowering.

The control method is to pay special attention to the aphids during the overwintering period. after wintering, you can spray a 5-degree stone sulfur mixture on the plant to eliminate the overwintering eggs, shovel the weeds near the flowers and eliminate the insect source. In the aphid danger period, 40% dimethoate or omethoate plus 1200 times water solution for continuous spraying, 3-4 times can be effective.

Scutellaria is one of the most important pests of rhododendron. It often sucks juice near the main vein on the back of the leaf, which forms many oil-stained fields on the back of the leaf, and finally causes the leaf to fall off. The insect is Obovate, about 0.3 mm long, flattened, red, dark red, wood red, irregular black spots on the back and irregular black patches on the side. This insect is most common when it is hot and dry in summer, and then decreases when the rainfall is long.

Control methods spray Baume 0.5 degree stone sulfur mixture once in mid-late October and early spring March respectively to spray 25% insecticidal water swelling agent 500 times the effect is also good.