Watermelon powdery mildew disease map watermelon white powder disease prevention and treatment method
Watermelon powdery mildew disease map Watermelon powdery mildew prevention and control method, powdery mildew is a common disease of watermelon, all watermelon producing areas in the country are distributed, southern spring watermelon and autumn watermelon can occur, but autumn watermelon occurs heavier, northern open field Watermelon in the summer, greenhouses and plastic greenhouses and other protected areas can be affected throughout the year, can be infected throughout the growth period, but in the middle and late growth occurs, let's take a look at the prevention and treatment of watermelon powdery mildew! Watermelon powdery mildew Watermelon powdery mildew mainly harms leaves, followed by petioles and stems, and generally does not harm fruits. At the beginning of the disease, white or nearly round star-shaped small powder spots are produced on the leaf surface or leaf back. Most of the leaf surface is used. When the environmental conditions are suitable, the powder spots rapidly expand and connect into pieces, which become a large white powder area with inconspicuous edges. White powdery mildew, when the whole leaf surface is covered with white powder. Less white powder on the petiole and stem. The disease gradually spread from the old leaves to the new leaves. In the late stage of the disease, the white mold layer turns gray due to the old mycelium, and the diseased leaves are yellow and curled, and generally do not fall off. When environmental conditions are not conducive to the propagation of bacteria or host aging, piles of yellow-brown small grain spots appear on the lesions, and then turn black. Watermelon powdery mildew occurrence conditions The occurrence and epidemic of watermelon powdery mildew is closely related to temperature, humidity and cultivation management. Plants that are densely planted, poorly ventilated and poorly illuminated in cultivation and management are prone to occur. Excessive nitrogen fertilizer, long plants, soil water shortage, and irrigation are not timely. The development of watermelon fields with rapid development, serious illness, excessive irrigation, low humidity, low terrain, poor drainage or close to greenhouses is also serious. The different growth stages of watermelon have different resistance to powdery mildew, and the young leaves in the seedling stage or adult stage are generally resistant to disease. Watermelon powdery mildew prevention and treatment method This article URL: Watermelon powdery mildew disease map watermelon powdery mildew prevention and treatment Herbal tea is a health drink made from flower buds, petals or tender leaves of flowers and plants after harvesting, drying and processing. There are many kinds of herbal tea with different characteristics. Therefore, it is necessary to make clear the pharmacological and pharmacodynamic characteristics of different kinds of herbal tea when drinking, so as to give full play to the health care function of herbal tea. Herbal Tea,Dandelion Tea,Calendula Tea,Honeysuckle Tea XuChang Youjia Food Product Development Co., LTD , https://www.yjgrain.com
The main varieties of herbal tea are chrysanthemum, rose, honeysuckle and so on.
How to brew: Herbal tea is usually brewed in a glass, China cup or pot with a lid and left for 2-5 minutes to release its active ingredients and distinctive floral aroma. But it is not appropriate to drink with zisha pot. Herbal tea belongs to non-fermentation tea, and it is mainly made of young and pollution-free flower buds and petals. The water temperature should not be too high when brewing, and the water temperature should be 80-90℃. Thermos cups are not suitable for brewing herbal tea, because under the condition of high temperature and constant temperature, various vitamins and aromatic substances contained in herbal tea will quickly be destroyed and reduced, and the tea will become dark in color and astringent in taste. In addition, in the process of brewing, the pot and cup should be sealed to reduce the loss of fragrance as far as possible.
Drinking skills: herbal tea is suitable for drinking, should not add milk, no or little sugar, can add a small amount of honey, to maintain the natural flavor.
Storage method: Herbal tea must be properly stored after purchase because it is rich in nutrition, fragrant and easy to be eaten by insects or damp. First of all, sealed packaging to prevent fragrance; Secondly, it should be placed in a cool and dry place to avoid direct sunlight and prevent deterioration and discoloration of herbal tea due to light, moisture and temperature. If the quantity of herbal tea is small, it should also be stored in a freezer bag and used up as soon as possible. The shelf life of herbal tea is generally 2 years, and the freshness period is 1 year. High temperature can also make the deterioration of tea materials, so usually stored in a cool place, but there is no need to put it in the refrigerator, otherwise, it is often easy to condense moisture caused by temperature difference when taking.