The main diseases and pests of poinsettia and their control
Chinese medicine believes that the sweet bitter rose, temperature, the most obvious effect is qi stagnation, promoting blood circulation silt and menstruation painkillers. In addition, the medicinal properties of roses are very mild, which can warm people's heart and blood, relieve the body's qi, play a calming, soothing, anti-depressant effect.
Rose Tea can reduce the anger, Yin and beauty, conditioning blood gas, promote blood circulation, beauty beauty, and to eliminate fatigue, heal wounds, protect the liver and gastrointestinal function, long-term drinking can also help to promote metabolism.
Special taboo
1>, rose tea has the effect of convergence, constipation are not suitable for drinking.
2>, the role of rose blood silt is relatively strong, excessive menstrual flow of people should not drink during menstruation.
3>, Wei Han, diarrhea, often feel tired, frail persons should not take.
Rose Tea Rose Tea,Herbal Rose Tea,Dried Rose Tea,Rose Buds Tea Yinchuan Qi Li Xiang Trading Co., Ltd. , http://www.welovegoji.com
I. Major pests and conditions
1. Main disease symptoms and conditions
(1) At the initial stage of powdery mildew infection, spots resembling insecticide residues appeared on leaves and sepals. Then, powdery mildew quickly spread and typical white moulds appeared on the surface of the plant, and the infected tissue became necrotic. The symptoms of powdery mildew first occurred on the back of the leaves, while the surface of the leaves often appeared green patches.
The pathogenic bacteria is Leveillula clavata, a species of the genus Penicillium, which damages the leaves, flower organs, and young shoots. In the early stages, a white, slimy moldy layer was formed, which turned grey later. The spores of powdery mildew can easily spread with the plants in the air. This disease can occur throughout the production season of poinsettia, with spring or late autumn being its high season. The disease is prone to occur when there is a high temperature and humid environment or when too much nitrogen is applied and the soil lacks calcium or potassium. In the cold, high humidity and large temperature difference between day and night, powdery mildew can quickly become popular.
(2) Gray mold Gray mold is the most common disease in poinsettia cultivation. It may appear throughout the long season of Poinsettia, and all parts of the plant may be infected. It mainly occurs in the winter season, when the poinsettia flowering season takes place, and once it is rainy and wet, the weather is often out of control.
The main hazards are poinsettia inflorescences, sepals and young shoots. Generally, water-infested lesions begin to appear in the inflorescence, and then gradually expand. The diseased tissue turns brownish to black and rots. Under humid conditions, a layer of gray to brownish layer forms on the surface at the late stage, and the lesions cover one area. Strains of pathogenic conidia. The pathogenic bacteria continued to spread to the sepals. The water-soaked discolored spots appeared at the beginning of the sepals, and then gradually expanded into irregular shapes. After the flowers were infested, they became brown and rotted and fell off. The pathogens extended to the shoots again, resulting in yellow-brown to brown lesions on the shoots. The later lesions were dark brown with depressions. In severe cases, the lesions were dry and completely lost their ornamental value. When infesting the sepals, the red lobe leaves become a kind of lavender leaf after it is affected. Young plants sometimes become infected near the surface of the cultivation medium. Under conditions of high air temperature, this rotten tissue will form a gray velvet mold, which is the conidial stem and conidia of the pathogen. A black rot appears on mature shoots, and this black rot develops around the shoots, causing wilting leaves on the damage surface.
The pathogen is botrytis cinerea pers., a subphylum of the genus Opistmcia. The pathogen is found throughout the entire greenhouse. It can survive on dead plant tissues or other organic matter, and is easy to see on juicy, aged and injured tissues. Growth and development, widespread parasites. As long as there is moisture, it exists, but prefers cool temperatures, which are prone to occur at low temperatures and high humidity (relative humidity of 90% to 100%).