According to the recent survey of Yongnian County Plant Protection Station, most of the greenhouse vegetable in our county grows well, but it is affected by the warm winter and recent weather changes, temperature fluctuations, greenhouse tomato, cucumber, eggplant, spinach, lettuce and other diseases serious.
Diseases mainly include Botrytis cinerea, eggplant gray mold, cucumber root rot, spinach downy mildew, and lettuce sclerotia. Tomato gray mold disease shed rate was 30%, diseased plant rate was 11.3%, diseased leaf rate was 1.1%; eggplant gray mold disease shed rate was 25%, diseased plant rate was 7.5%, diseased leaf rate was 1.1%; spinach downy mildew disease shed The rate is 15%, the diseased plant rate is 1.2%, the diseased leaf rate is 0.15%; the cucumber root rot disease morbidity rate is 80%, the diseased plant rate is 5%-70%; the bacillus sclerotiorum disease sickness rate is 25%, the diseased plant rate is 7.5% . According to future weather forecast, combined with historical data analysis, vegetable diseases have aggravated hazards, and vegetable farmers should prevent and control them early to ensure the safety of vegetable production. Prevention methods are as follows:
I. Agricultural control
1. For the unplanted sheds, remove debris from the upper pod before soil preparation to reduce the bacteria source. It should be covered with high mulching film.
2. Before the colonization of greenhouse vegetables, they were sterilized by fumigation. Each mus of the plants was sprayed with 10% chlorothalonil or 10% procymidone smoke agent 400-500 g.
3. Remove diseased leaves, diseased flowers, and diseased fruits in a timely manner after the onset of illness to bring out the shed and reduce the source of infection.
4. Do not apply water before the onset of rainy weather. Also, do not apply pesticides, moderately ventilate in the afternoon, and reduce the humidity in the shed.
5. Add 0.1% amount of 2.5% fludioxonil suspension or 65% thiophanate-methyl WP to prevent flowering and fruiting when sprayed (floral).
Second, chemical control
1. Induce immunity. Spraying 0.136% Bi Hu wettable powder 15,000 times liquid plus 25% azoxystrobin suspension 1500 times plus 0.5% amino oligosacin 500 times liquid, regulate plant growth and induce plants to produce immunity and disease prevention.
2. Prevent medication. In the absence of disease, spraying 65% zeocin (blue) WP 500 times or 40% chlorothalonil (Saiyan) 500 times suspension can play a role in the prevention of disease.
3. Gray mold, Sclerotinia prevention and treatment. Can spray 70% pyrimethanil (Meican) water dispersible granules 1500 times, 70% thiophanate-methyl (Kato) suspension 500 times, 50% iprodione (prodigemin) suspension 1500 Dilution or 50% boscalid (Kaiser) water dispersible granules 2000 times control.
4. Downy mildew control. Use 72% cream urea manganese zinc wettable powder 500 times liquid or 57% acryloyl zinc (water force) water dispersible granule 600 times liquid plus 2% kasugamycin wettable powder 500 times liquid spray control.
5. Root rot disease prevention and control. 72% cream urea manganese zinc wettable powder 500 times liquid plus 45% tebumidamide water emulsion 1500 times spray, or sprayed with 21% peracetic acid 150 times liquid plus 6.5% bactericidal 250 times liquid spray At the base of the stem, the rootstock may be irrigated with an enzyme humic acid or Bacillus subtilis.
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