Protected vegetables against disease

February 10, 2020

Since the beginning of the rain in early February, the greenhouse vegetables have been exposed to low temperatures, high humidity, and poor light conditions. The occurrence of fungal diseases has aggravated. According to recent field surveys, some sclerotium and eggplant seedbeds have already emerged as sclerotial disease centers, and white cotton flocculent hyphae have spread and spread. Sclerotinia and other diseases such as brown sclerotia, bollworm disease, and disease are expected in the seedling stage of solanaceous fruit crops. Both will tend to occur with moderate weight loss, and some old bed disease with high groundwater level, high humidity, and heavy onset in previous years will tend to re-emerge; downy mildew of lettuce, lettuce, and cabbage will tend to occur more seriously.

In the prevention and control of fungal diseases in protected areas, we must promptly ventilate and disperse moisture, control the humidity in the shed, and conduct chemical control in a timely manner.

1. The sclerotinia and brown zebra disease of solanaceous fruit crops were treated with dew and dried after the onset of sunny days in the early stage of disease. The commonly used drug was Ledomil (58% zinc-based metalaxyl WP) 600 times. Sulfamethoxazole (50% procymidone WP) 700 times, acetaminophen (50% iprodione wettable powder) 1000 times. In case of rainy days, a procymidone or chlorothalonil and procymidone-type smoke agent can be used in greenhouses.

2. For the blight disease and epidemic disease of Solanum edodes, 50% Kedemane wettable powder 500 times solution can be sprayed on the seedbed before planting, and 50% Carbendazim wettable powder 5 kg mixed soil and 100 kg can be used for spreading and colonization. Within the hole, after the seedlings are regenerated, they are sprayed with 70% of the dexamethasone WP 500 times or 70% dexamethasone WP 500 times. If the diseased plants are found in the field and the protection is sprayed, the commonly used drugs include 75% chlorothalonil WP 500-600 times, thiophanate-methyl (50% thiophanate-methyl WP) 800 times, and 40 times. % Triethylphosphonic acid aluminum wettable powder 200 times liquid and so on.

3, on the lettuce, lettuce, cabbage downy mildew, should strengthen the management of fertilizer and water at the same time timely pruning, improve ventilation and light conditions, and timely removal of diseased leaves, disease, the onset of the disease can use 58% of the generation of zinc? Ling wettable powder 500 times liquid, 75% chlorothalonil wettable powder 600 times liquid, 25% metalaxyl wettable powder 600 times liquid, 70% mancozeb zinc wettable powder 500 times liquid spray control.

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