What's wrong with this flower? There are white hairs on the leaves.

There are three measures to control powdery mildew.

Ventilation, cut off bad leaves.

use

Sorry, I was busy just now.

Spraying plant leaves and branches with 800 times solution of 50% thiophanate methyl wettable powder or 600 times solution of 75% chlorothalonil wettable powder every 7 ~ 10 day/time, and spraying continuously for 2 ~ 3 times.

2. The causes of powdery mildew are generally easy to occur in warm, dry or humid environments, and too much nitrogen fertilizer is applied, so is the lack of calcium or potassium fertilizer in the soil. Too dense plants, poor ventilation and light transmission, serious diseases. Severe temperature changes, excessive drying of soil in flowerpots, etc. It will reduce the expansion pressure of host cells, thus weakening the disease resistance of plants and easily causing diseases.

The measures to prevent powdery mildew are pruning and shaping in time, removing diseased branches and leaves, and improving ventilation and light transmission conditions between plants. Indoor potted roses should be placed in a well-ventilated and well-lit place. Indoor temperature and humidity should be controlled in winter and ventilation should be paid attention to at night. Before moving into the greenhouse in late autumn and early winter, you should carefully check and find that the diseased leaves and shoots should be cut off and burned immediately to avoid indoor transmission.

Welcome to pay attention, the evaluation is very satisfactory.

thank you