Control of powdery mildew of Coptis chinensis

Coptis chinensis is afraid of high heat, likes low temperature, likes cool and humid, and is generally suitable to be planted at an altitude of 800m-1500 m. In large-scale production, high temperature and humidity in summer and autumn can easily lead to a large number of Coptis powdery mildew, seriously affecting the growth and development of Coptis chinensis.

The main symptoms of powdery mildew of Coptis chinensis are a layer of white-gray powdery substance on the back of the leaf, green loss and black markings on the front of the leaf. The disease in the seedling stage can cause the whole plant to die, and the disease in the seedling stage can cause the leaf to wither and the rhizome to stop growing, which can seriously reduce the yield of Coptis chinensis. Drug farmers regard powdery mildew as the number one "enemy" in the production of Coptis chinensis, and must be detected early, prevented and controlled thoroughly, so as to prevent it from spreading into disasters. In the long-term production practice, pharmaceutical farmers in Chuanzhu Township of Emeishan City summed up the comprehensive measures to control Coptis chinensis powdery mildew. The specific methods are as follows:

1. Plant ash can be used for prevention. Hay wood ash is sprinkled once before planting and transplanting, and once again after emergence and 1 month after transplanting. The dosage per mu is 30 kg in seedling stage and 50 kg in seedling stage.

2. It can be sprayed with 10-20 times of human urine, 4 kg-5 kg per mu.

3. 50% carbendazim wettable powder can be sprayed with 500-800 times liquid, with 200-250 grams per mu, and the prevention and treatment at the initial stage of the disease is better.

4. 50% topazine wettable powder can be sprayed with 500-800 times liquid.

5. It can be sprayed with miscellaneous bacteria regulator, 25 kg-30 kg / mu of water with 10 g / mu at seedling stage and 50 kg / mu with 20 g / mu at seedling stage.

6. Sulfur suspending agent can be sprayed with 200-400 times liquid, 150 grams-200 grams per mu.

7. Can be sprayed with Kesha 2000 wettable powder-1000 times liquid.

8. 0.6% Lvwangjiu 3000 times liquid can be sprayed to restore the normal growth and development of the diseased plant. It can be mixed with the above agents, and the effect is more remarkable. Sporadic disease can cut off diseased leaves and incineration plus spray comprehensive prevention and treatment.

Medication precautions: generally choose to spray on cloudy days, if you encounter rain within 4 hours after spraying, you should spray again to ensure the efficacy. The above insecticides can be used alternately from 2 to 3, which can effectively reduce the drug resistance of the disease. Generally every 7-10 days spray, even spray 3 times can cure Coptis chinensis powdery mildew.