Recent surveys have found that the occurrence of gray mold in tomato in spring blight is widespread. According to the census, the disease shed rate was 100%, the diseased plant rate was 25%, the diseased leaf rate was 4.3%, and the diseased leaf rate in severe plots was as high as 28.5%. All growers should start hands early and do a good job in checking and managing to ensure that this year's tomatoes have a bumper harvest.

I. Agricultural control

1. Remove debris from the upper palate to reduce the bacteria source before site preparation.

2. Fumigation before greenhouse colonization, 10% chlorothalonil or 10% procymidone smoke agent 400-500 g per acre.

3. timely removal of diseased flowers. Take it lightly, destroy it centrally, and reduce proliferation.

4. Before the onset of rainy weather, water should be banned, avoid flooding and flooding, and do not apply pesticides. Pay attention to moderate wind protection in the afternoon and reduce the humidity in the shed.

5. Adding 0.1% of 2.5% fludioxonil suspension or 65% thiophanate-methylmycophenolate WP in the flowering period during the flowering period.

6. It is necessary to use mulching film covering cultivation, watering under the membrane, and reducing the air humidity in the shed to not only effectively control the gray mold, but also increase the plant growth potential and increase the yield.

7.Improve the conditions of light transmission in the shed, make it densely planted, prevent the density from being too large, cause poor ventilation and light transmission in the middle and lower parts; timely rectify snoring, pick the old leaves of the lower part of the plant; often scrub the shed film, keep the shed film clean and improve the light transmission. rate.

Second, chemical control technology

1. Induce immunity. Can spray 0.136% Bi Hu wettable powder 15,000 times fluid plus 25% azoxystrobin (Amisida) suspension 1500 times plus 0.5% amino oligosaccharide water 500 times.

2. Prevent medication. Spray 65% ​​Zeoxin (blue) wettable powder 500 times or 40% chlorothalonil (Saiyan) 500 times suspension.

3. Treatment medication. Can spray 70% pyrimethanil (Meican) water dispersible granules 1500 times, 70% thiophanate-methyl (Kato) suspension 500 times, 50% iprodione (prodigemin) suspension 1500 Times of liquid, 50% procymidone (Sulfacin) 1000 times or 50% boscalid (Kaiser) water dispersible granules 2000 times.

Third, pay attention to matters

1. Botrytis cinerea is a weak parasite that is susceptible to drug resistance. These agents must be used interchangeably or mixed with different mechanisms. A protective agent may be added to the therapeutic agent.

2. The key parts of the spray are the leaves of aging (including fractures), the open flowers, and the green fruits.

3. The two-time interval application is easy to choose in sunny days after continuous rain, grasping 7-10 days once.

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