What are the methods for controlling azalea pests?

Azalea, also known as yingshanhong (mountain red) and shanshiliu (mountain pomegranate), has bright red corollas and high ornamental and medicinal value. Azaleas sometimes suffer from pests, mainly red spider mites, azalea lace bugs and aphids. Below is an introduction to azalea cultivation tips: azalea pests and their control methods.

1. Red spider mites

Red spider mites on azaleas occur mainly on the underside of leaves; when the infestation is heavy, they are also found on the underside of leaves and on tender shoots. After red spider mites appear, the leaves develop fine, scattered spots of alternating yellow and green.

Control method: Create a well-ventilated environment so that the azalea grows vigorously and its resistance to red spider mites increases. If the infestation is heavy, the severely affected areas can be pruned off to reduce their population; if many densely packed shoot tips are affected, biological insecticides of the nicotine class such as abamectin can be sprayed.

2. Azalea lace bugs

Azalea lace bugs occur mainly on the underside of leaves; when they appear, some black spots and small insects about 2-3 mm long with transparent wings can be seen on the underside of the leaves, and spots of alternating yellow and green also appear on the upper surface, but these spots are finer than those appearing with red spider mites. When they occur, they spread from the leaf veins toward the leaf margins, and the infestation is noticeably heavier in the center of the leaf than at the margins.

Control method: If there are few pests, the diseased leaves can be picked off and burned to prevent reinfection; if the infestation is heavy, imidacloprid can be used for control.

3. Aphids

Aphids occur mainly on the underside of leaves and on tender shoots, appearing as small greenish-white insects, some winged and some wingless, usually clustered together.

Control method: When few appear, they can be taken to a faucet and rinsed off; or some yellow sticky insect traps can be hung around the azalea; tobacco-soaked water can also be used for control. If the infestation is heavy, imidacloprid can be sprayed. After one application, a second application should be made 3-7 days later to kill the larvae that have not yet hatched from the eggs.