Symptoms: many irregular brown spots of different sizes will appear on the leaves in the early morning, and then gradually expand into dark brown spots. When it is serious, the whole leaves will be covered with disease spots until they are dry and fall off. The stems will also be dry and rotten with it, causing great damage to the geranium.
Prevention and control: at the beginning of planting, make sure that the density is not too large, and do a good job of ventilation and light transmission. Avoid splashing when watering, otherwise it will dry up. If any diseased leaves or branches are found, they need to be cut and destroyed in time, and Bordeaux solution should be sprayed every two weeks.
Symptoms: damage the flower part first, causing the edge of the petal to darken, and there will be a gray mold layer on it. If the flower falls on the leaf, it will also cause the leaf disease.
Prevention and control: remove the diseased leaves and flowers in time, and spray chlorothalonil at the beginning of the disease.
Symptoms: both nymphs and adults will suck the juice inside, causing the leaves to turn yellow, wilt and even the whole plant to die.
Prevention and control: spray can be used for prevention and control. The agents can be chamomile emulsion, zinc chloride emulsion, acetamiprid, etc.
