Powdery mildew powdery mildew mainly affects the leaves, shoots, buds and pedicels of the rose. After the tender leaves become sick, the leaves shrink, become deformed and sometimes turn purple. The old leaves are sick, the leaves appear nearly round, and water stains are chlorotic yellow spots. When the leaves are seriously damaged, the leaves wither and fall off. The young shoots and pedicel affected parts are slightly enlarged and their tops are curved toward the ground. Buds cannot be opened or deformed after infestation, and the surface of the affected area is covered with a white powder layer. In the open cultivation season, powdery mildew occurred in spring (May-June) and autumn (September). During the greenhouse cultivation season, powdery mildew can occur for an annual period. When the room temperature is above 5°C, powdery mildew can cause harm. High temperatures, high humidity, sultry heat, poor ventilation, severe disease. Control measures 1. Application of nitrogen fertilizer should not be too much, should be appropriate to increase the amount of calcium and potassium fertilizer, so that plants grow strong and enhance disease resistance. 2. Spray 3 to 4 Baume degrees lime sulfur before germination to eliminate the overwintering germs. 3. Spray 15% triadimefon 1000 times or 50% carbendazim 800 times in the early stage of the disease. Food Additives are substances added to food. Some additives have been used for centuries. With the advent of processed foods in the second half of the twentieth century, many more additives have been introduced, of both natural and artificial origin. Food Additives Food Additives,Natural Food Additives,Food Additives Preservatives SINOCHEM PHARMACEUTICAL CO., LTD , http://www.sinochemnutrition.com
The advantages of food additives are these followed:
1. Improve the appearance of food.
2. Keep and enhance the nutrition value of food.
3. Increase the variety and conveniences of food.
4. Miantain freshness and prolong shelf life.
5. Provide leavening or control acidity and alkalinity.