Identification and Control of Botrytis cinerea in Cabbage

Cabbage (Brassica oleracea L.) is an annual or biennial herb of Brassica in Cruciferae, which is one of the most important vegetables in China. In addition to kale native to China, all varieties of kale originated from the Mediterranean to the North Sea coast. It was cultivated by the ancient Romans and Greeks as early as 4000,4500 years ago.

Growth environment of cabbage

Cabbage is warm and moist, with plenty of light. More cold-resistant, but also have the ability to adapt to high temperature. The suitable temperature for growth is 15-20 ℃. If the fleshy stem is enlarged at a high temperature of more than 30 ℃, the fleshy stem is prone to fibrosis. The selection of soil is not very strict, but it is suitable for planting in humus-rich clay loam or sandy loam. Cabbage seedlings must undergo vernalization at 0-10 ℃, then bolting, flowering and fruiting under long sunshine and suitable temperature.

Distribution range of cabbage

Originated from European and American countries, it is mainly distributed in cooler areas such as Northeast, Northwest and North China and South China.

Identification and Control of Botrytis cinerea in Cabbage

Grey mold (BotrytiscinereaPers.) Most of them occurred in protected cabbage, and the incidence tended to be aggravated.

Field identification of Botrytis cinerea in cabbage:

Most of the disease occurs first from the leaves close to the surface, the disease part is immersed in water at the beginning, and when the humidity is high, the disease part expands rapidly, showing brown or light reddish brown, causing rot and gray mildew in the disease part. The disease occurs at the base of the stem, and the diseased part becomes brown and rotten. There is a gray mildew, which develops from the bottom up, and the outer leaves wither and expand to the whole leaf ball, resulting in decay. In the later stage of the disease, the disease sometimes produces small round black sclerotia.

Causes of Botrytis cinerea in cabbage:

The germs overwintered on the ground with the diseased remains. It is spread by wind and rain, and the disease is caused by the invasion of wounds or weak parts. The disease is easy to occur when the bacteria like temperature, humidity and weak light, the temperature is about 20 ℃ and the relative humidity is more than 90%. The management is extensive, the plant growth is weak, and the disease is aggravated.

Main points of prevention and control of Botrytis cinerea in cabbage:

① uses purple light film to buckle the greenhouse and roast the field early.

② carries out good fertilizer and water management to strengthen seedlings and prevent diseases.

③ properly control irrigation and strengthen ventilation and dehumidification.

④ keep the greenhouse film clean and increase the light as much as possible.

⑤ removed the diseased plant in time and buried it deeply. After harvest, thoroughly remove the sick and disabled bodies and dig deep into the soil.

⑥ medicament control can use 50% propofol 2000 times, or 50% prohydantoin 1500 times, or 50% nonglide 1000 times, or 40% methomyl 600x, or 68% trimethoprim 800 times, or 30% chlorpromazine 800 times. When the protected area is closed, you can use 10% chlorpromazine smoke agent 3.75 kg per hectare, or spray 10% chlorpromazine dust agent 15 kg per hectare.