Pests and diseases of forsythia and their control methods

Forsythia’s diseases and prevention methods leaf spot disease

Forsythia’s leaf spot disease is caused by the infection of Deuteri fungi. The fungus first infects the leaf margin. As the disease progresses to the middle of the leaves, the entire plant will die in the later stages of the disease.

The disease begins to appear in mid-to-late May, and peaks in July and August. High temperature, high humidity and lack of ventilation are conducive to the spread of the disease. Prevention and treatment methods

To prevent and control leaf spot, you must pay attention to regular pruning of branches, remove redundant branches and overly dense branches, and keep the plants ventilated and light.

When cultivating forsythia, we must also strengthen water and fertilizer management, pay attention to nutritional balance, and do not apply nitrogen fertilizer excessively.

If Forsythia suspensa is found to be suffering from leaf spot disease, it can be controlled by spraying 75% chlorothalonil wettable granules 1200 times or 50% carbendazim wettable granules 800 times once every 10 days. , spraying 3-4 times continuously can effectively control the condition.

Pests and prevention methods of Forsythia. Types of pests

Common pests of Forsythia include the broad-winged wax cicada, the transparent sparse wax cicada, the mulberry shield scale, and the ivy buckler. Scales, round-spotted leaf-rolling weevils, dwarf armyworms, pine oak caterpillars, and white-bearded velvet moths. Control methods

If Forsythia suspensa is attacked by the above pests, different methods should be adopted according to different pests.

Spray 10% imidacloprid wettable granules 2000 times or 25% scavenging suspension 1000 times to kill the transparent and sparse wax cicadas and the broad-winged wax cicadas.

During the peak stage of nymph egg formation, spray 400 times the solution of 95% scale mite emulsion or 1000 times the solution of 20% succinimide emulsifiable concentrate to kill the white shield scale.

Spray 3% high-osmotic fenoxycarb emulsifiable concentrate 3000 times in the adult stage of round-spotted leaf weevil to kill it.

In the larval stage of Spodoptera exigua, spray 20% Confudo concentrated solvent 3000 times to kill it.

Spray 3% hypertonic fenoxycarb emulsifiable concentrate 3000 times in the larval stage of pine oak caterpillars to kill them.

When the damage caused by the white-bearded velvet moth is serious, 1.2% nicotinine 1000 times can be sprayed to kill it.

The above methods are only in the early stages of insect infestation. If the plant is severely infested, the plant must be treated and destroyed in time to prevent the spread.