What are the diseases of tobacco leaves and how to prevent them?

1, tobacco black stem disease. The initial stage of the disease is the key period of prevention and control, and dimethomorph can be used; Refined nail paste manganese and zinc; Or rotten frost, manganese and zinc, sprayed every 15 days 1 time.

2. Tobacco black rot. At the beginning of the disease, you can choose: thiophanate methyl; Carbendazim; Or thiram, per plant100 ~ 200ml.

3. Tobacco bacterial wilt. At the initial stage of the disease, it can be used as follows: 65.438+000 billion units of Bacillus subtilis wettable powder 750~900 g/ha mixed water spray; Or 300 billion units of Pseudomonas fluorescens powder 7687.5-9937.5g preparation/hectare, adding water to irrigate the roots; Or 600-800 times of 3% zhongshengmycin wettable powder.

4. Tobacco brown spot disease. At the beginning of the disease, you can choose: mancozeb; Polyoxin; Sanjunjing is sprayed every 10 day/time, 2~3 times in a row.

5. Tobacco virus disease. The following drugs can be used at the initial stage of the disease: aminoglycoside; Moguanidine copper acetate; Or lentinan, spraying for prevention and control.

6. Tobacco wildfire disease. At the initial stage of the disease, the diseased leaves should be removed in time, and kasugamycin and copper hydroxide should be selected and sprayed with water at an interval of 7- 10 day for 3-5 times.

7. Tobacco mildew. The following chemicals can be selected to control aphids: pymetrozine; Acetamiprid or thiamethoxam.

8. Tobacco suddenly falls ill. At the beginning of the disease, you can choose to spray: chlorothalonil; Spray trichloroisocyanuric acid, namely metalaxyl, every 7~ 10 days for 2~3 times.

9. Tobacco anthracnose. At the initial stage of onset, the following agents can be sprayed: chlorothalonil, zineb or thiophanate-methyl, every 7~ 10 day 1 time, 2~3 times in a row, and 4~5 times in severe cases.

10, tobacco spot disease. Combined with the prevention and control of anthrax, spraying thiophanate-methyl, carbendazim or chlorothalonil in time after transplanting, before or just after the onset.

1 1, tobacco wilt. At the beginning of the disease, spray or water: carbendazim; Thiophanate methyl or chlorothalonil, each plant is poured with liquid medicine for 2-3 times.

12, tobacco downy mildew. At the beginning of the disease, spray or water: propineb, metalaxyl, manganese zinc or manganese zinc and alkenyl, with 50 ~ 70l of mixed liquid medicine per mu, and pay attention to the positive and negative leaves when spraying.

13, tobacco bow black disease. Continuous spraying: carbendazim, thiophanate-methyl or chlorothalonil.

14, tobacco Sclerotinia sclerotiorum. At the early stage of the disease, individual diseased tobacco plants were pulled out and the diseased spots were disinfected with lime powder. You can also choose: Jundijing, iprodione, or procymidone, spray it on the roots of tobacco plants and the surrounding soil surface every 10 day, and then control it for 3~4 times.

15, tobacco white silk disease. Spraying ethephon, benomyl or carbendazim at the initial stage of the disease, focusing on the stem base, for 7 ~ 10 days, 1 time, and continuous control for 2 ~ 3 times.

16, tobacco powdery mildew. At the initial stage of the disease, the following drugs are selected for prevention and treatment: triadimefon, triadimefon carbendazim, or triadimefon thiram, which is sprayed 2-3 times every 7- 10 day, alternately, evenly and fully.

17, tobacco black spot. Spraying: chlorothalonil+mancozeb, or mancozeb.

For reference only, welcome to pay attention to praise, thank you.