Reasons and Treatment for Black Spots on Syringa Leaves
You may not be aware of the small plant cultivation experiences regarding the reasons and treatment for black spots on syringa leaves. Detailed information will be shared next.
Reasons and Treatment for Black Spots on Syringa Leaves
The black spots on syringa leaves are likely caused by pathogens, which commonly appear in humid and hot environments, leading to the growth of pathogens. Bordeaux mixture can be initially sprayed at a concentration of 0.1%-1.0%, and other agents such as disinfectants can also be used. Additionally, calcium hypochlorite or sulfur powder can be sprinkled under the shrub. The plant can then be moved to a well-ventilated, sunlit environment for care to promote better growth and avoid black spots on the leaves.
What Causes Black Spots on Syringa Leaves
1. The black spots on syringa leaves are likely caused by pathogens, which commonly appear in humid and hot environments, leading to the growth of pathogens. 2. It could also be due to the leaves rotting, which can cause black spots, likely due to excessive watering. Therefore, it is important to control the amount and frequency of watering.
Are Black Spots on Syringa Leaves Sunburn?The black spots on syringa leaves should not be sunburn. If the light is too strong, the leaves may get scorched and turn yellow. Yellow leaves should be cut off and moved to a shaded area, with appropriate watering to promote quick recovery.
What to Do When Syringa Leaves Have Black Spots
1. Prune the branches and leaves
If maintenance is not proper, its leaves can easily develop black spots, possibly caused by pathogens. It is important to prune the black leaves of the plant promptly to prevent all branches and leaves from turning black and withering to death.
2. Change the potting soil
Black spots on syringa leaves may also be caused by improper watering and fertilizing, as well as unsuitable soil. In this case, the potting soil should be changed for care, the plant should be dug out of the soil, and rotten roots should be treated promptly. The roots and soil should be disinfected with carbendazim.
3. Spray pesticides
If black spots on syringa leaves are caused by diseases or pests, a fungicide such as carbendazim or belinjing can be sprayed on the plant every week for prevention, with 3-4 consecutive applications to help the leaves gradually recover.
Bordeaux mixture can also be used, initially sprayed at a concentration of 0.1%-1.0%, and other agents such as disinfectants can also be used. Additionally, calcium hypochlorite or sulfur powder can be sprinkled under the shrub.
4. Improve the environment
Syringa can be moved to a well-ventilated, sunlit environment for care, and during summer, it can be placed in a diffused light environment to promote better growth and avoid black spots on the leaves.
Preventing Black Spots on Syringa Leaves
Remove fallen leaves from syringa promptly to eliminate overwintering disease sources; cut dense branches to ensure ventilation and light; and spray a 50% wettable powder of benoit at 1000 times or a 25% wettable powder of triazole during the outbreak.
The above information is about the reasons and treatment for black spots on syringa leaves, hoping it will be helpful to you!