The leaves of the small cabbage planted on the balcony at home have white powdery things on them, an

Powdery mildew is a fungal disease, which has two stages: staged and non-phased. In cold regions, the pathogen overwinters with the diseased residue in the closed capsule shell of the fruiting body in the sexual stage, and becomes the source of the initial infection of the disease in the second year. The secondary source of infection is the conidia produced in the diseased area.

In warm regions, the bacterium uses conidia as the inoculum for primary invasion and re-invasion to complete the annual cycle of disease. The disease mainly affects the leaves. At the beginning of the disease, the foliar surface appears to be amorphous, amorphous, and the demarcation is not obvious; The corresponding apostulous white spots appear on the back of the leaf, and the marginal boundaries are not obvious.

With the development of the disease, the number of lesions increases and expands, and is connected to each other to form plaques, the symptoms of spot flour are more and more obvious, and in severe cases, most or even all of the leaves are covered, and the appearance is like being covered with a layer of flour, hence the name. The following measures can be taken to prevent it: appropriate supplementation of phosphorus and potassium fertilizers, supplementation of foliar fertilizers, and enhancement of plant resistance; At the beginning of the disease, continuous spraying of golden century or 60 bacteria can obtain 100 times the solution.

The cabbage planted in the ground has a white powdery leaf surface, is it sick? Can you eat it?