Powdery mildew is the main disease in strawberry in greenhouses in our city. It occurs during the whole growth period of strawberries. The optimum temperature for powdery mildew is 15°C-25°C, and the temperature in the greenhouse is just adapted to the occurrence of powdery mildew. Therefore, the strawberry powdery mildew is mainly damaged by the greenhouse cover film, especially when the strawberry blooms and blooms and enters the fruit-producing stage. In the future, the most serious damage has seriously affected the growth, development, yield and quality of strawberries. The main symptoms are: dark-stained patches of varying sizes at the initial stage of leaf wounds, followed by white powders on the dorsal plaques, reddish brown spots at the later stage, leaf margin atrophy, and kerosene; Development, desiccation, if later victim, fruit surface covered with - white powder. In the greenhouse, the temperature and humidity are constant, and it is less affected by the outside world and the incidence is frequent. It is difficult to prevent and control, but wet and rainy climate will increase the incidence of strawberry powdery mildew in the greenhouse. The arid climate will have a certain inhibitory effect on the occurrence and development of powdery mildew. The control of strawberry powdery mildew in greenhouses should be based on prevention, comprehensive prevention and control, and the combination of agricultural control and chemical prevention so as to achieve the purpose of improving yield and quality. First, agricultural control 1. A reasonable rotation. Reasonable rotation should be carried out in places where conditions permit, so as to reduce the number of pathogenic bacteria and reduce the occurrence of diseases. 2. Select resistant varieties and disease-free seedlings. 3. Remove old leaf disease leaves in a timely manner, and bring old diseased leaves out of the field and destroy them to reduce the chance of re-infection. 4. Reasonable fertilization to prevent partial application of nitrogen fertilizer. 5. Reasonably irrigate, control the humidity in the shed to reduce the occurrence of disease. Second, chemical prevention The key to prevention and control of chemical prevention is prevention. We must master two points: First, timely prevention and control, spraying before flowering to prevent 2 times, spraying immediately after the onset of disease in the early stage of disease prevention, severe disease field should be continuous drug control 2-3 times. The second is the selection of pharmaceuticals. The selection of pharmaceuticals should take into account the characteristics of strawberry growth. Because of the high economic value of strawberries, the environment for growth of greenhouse strawberries is relatively closed. The selection of pharmaceuticals must first consider safety, especially in the flowering period, and safety should be considered. The agent used will have adverse effects on the growth of strawberries, or affect the quality of strawberries, followed by the control effect. The results of the comprehensive trial showed that triadimefon, centella, vitraconazole, and Shigao had good control effects on strawberry powdery mildew, but triadimefon was prone to produce phytotoxicity that affected the growth of strawberries. Therefore, triadimefon was not easy to use in strawberries. Used on production. The effect of immortality is obvious, but after spraying, there will be obvious white spot on the leaves and fruits, which will affect the appearance of the strawberry. Therefore, immortality should not be used during the long fruit period of the strawberry, and it can be used during the strawberry seedling stage. Myclobutanil, the world's high control effect, safe production of strawberries, can be used in large areas, the use of 12.5% ​​myclobutanil and 10% Shigao to 1500 times as good, production should not blindly increase the concentration, especially myclobutanil, High concentrations have an adverse effect on strawberry growth. According to our many years of experience, prevention and control of strawberry in greenhouses should be based on prevention. It is not appropriate to use the same pesticide for a long period of time alone, and it should be used interchangeably to improve the control effect and prevent the occurrence of disease resistance.
Organic Acids Powder
The classification of organic acids powder can be divided according to its source, structure and function, etc. The following are some common classification methods:
According to the source: Organic acid powder can come from natural plants, animals or microorganisms, and can also be obtained by chemical synthesis.
According to the structure: organic acid powder can be divided into carboxylic acid, ester, amide and other types.
According to function: organic acid powder can be divided into flavoring agents, preservatives, acidifiers, nutritional fortifiers and other types. Common organic acid powder are kojic acid powder, glycyrrhizin powder and so on. Kojic acid powder is a kind of weakly acidic organic compound made by microorganism through fermentation, which is mostly used in food, cosmetics and other fields. Glycyrrhizin powder is a brown powdered organic synthesis intermediate, which is often used in medicine, food and other industries.
Organic acid powder mainly has the following effects:
1. Antibacterial anticorrosion: can inhibit the growth of microorganisms, extend the shelf life of products.
2. Seasoning and acid: adjust the acidity of food, improve taste.
3. Promote digestion: help the secretion of digestive fluid, promote the digestion and absorption of food.
4. Antioxidant: Has a certain antioxidant capacity, can protect food and human cells from oxidative damage.
5. Nutritional enhancement: Some organic acid powder also has a certain nutritional function.
Organic Acids Powder,Acid Citric Sweetening,Citric Acid Monohydrate,Malic Acid Food Additive
Shaanxi Changsheng Industrial Co., Ltd. , https://www.cncsbio.com