Common diseases of Osmunda japonica and their control methods

Symptoms of powdery mildew of Osmunda japonica

Powdery mildew of Osmunda japonica generally occurs on tender buds. In spring and summer, infected leaves will grow twisted and covered with white powder. There will be round spots on the leaves, which will turn into a piece in severe cases. Damaged leaves will fall off early because of diseased spots.

Prevention and cure method

Potted osmanthus should remove the diseased leaves in time and move to a ventilated and transparent place.

Once the diseased spots appear on the leaves, spray the chemicals in time. Zineb WP 500 times solution, thiophanate-methyl 1000 times solution and Bordeaux solution can be selected. And spray once every 10 day, just 3~4 times.

Black spot symptoms of Osmunda japonica.

Soot disease mainly harms the leaves and branches of Osmunda japonica. A layer of black mold appeared on the petiole, which affected the photosynthesis of the plant. Sooty blotch is mainly caused by insect pests or fungal infections, especially in hot and rainy weather.

Prevention and cure method

Strengthen ventilation and reduce the humidity in the air. Don't just water, keep the soil relatively dry.

Be prepared for insect prevention. After May, the temperature will gradually rise. Spray a flower protector once a month to avoid aphids or scale insects.

Trim diseased leaves and spray fungicides. For blackened leaves, if they wilt and turn yellow after being washed with clear water, they need to be cut off immediately, and then sprayed with fungicides to avoid the spread of diseases.