What pests and diseases do you need to control for planting chrysanthemum?

Diseases of chrysanthemum: Common diseases of chrysanthemum mainly include black spot, powdery mildew and blight. In Shenzhen, the most serious disease that harms chrysanthemums is black spot. The disease occurs from the lower leaves of the plants, and the leaves appear brown spots at the beginning of the disease, and then expand into round, elliptical or irregular lesions. In severe cases, the leaves become dark and dead. The disease can occur in the whole growth period of chrysanthemum, and the incidence of autumn chrysanthemum is heavier, especially in high temperature and rainy weather. In the early stage of powdery mildew, the leaves showed yellow spots. Later, they gradually expanded into pieces. The diseased part was covered with white powdery mildew, which is the fruiting body of the pathogen. The leaves of the severely susceptible leaves were distorted and the yellow leaves fell off. More. Fusarium: The upper part of the damaged plant initially showed pale leaf color, tarnished, slightly corrugated, wilting and drooping, the base of the stem was slightly swollen and brown, the epidermis was rough, there was a crack between them, and in the case of severe white fungus The roots become black and rot, the root hairs fall off, the harmful substances secreted by the bacteria destroy the host cell tissue and block the catheter, so that the water supply is blocked, the plants quickly wilted and die, and the disease occurs more severely in summer.

The common pests of chrysanthemum are aphids and red spiders. Aphids are the main pests of chrysanthemum. The damaged part of the plant grows slowly, the leaves are curled and deformed, and the plants with serious damage are yellow and deformed. The flower buds cannot develop normally. In Shenzhen, the period from April to May and September to October is the prosperous period. Qiuju is the most dangerous. A large number of mites are concentrated in the young shoots, flower buds and leaf backs of chrysanthemum, causing heavy losses to chrysanthemum production. Red spiders mostly occur in the high temperature and dry season, lurking on the back of the leaves, sucking the leaf juice, causing the leaves to dry and yellow, and the flower buds endanger the flower buds, so that the flowers quickly wither. Linyi Fertilizer Network Copyright
To do a good job in the comprehensive prevention and control of diseases and insect pests of chrysanthemum, there are three key points: Linyi Fertilizer Network Co., Ltd.
First, strengthen the management of fertilizer and water, cultivate robust plants, and improve disease resistance. Linyi Fertilizer Network Copyright
Second, prevention is the main, usually combined with the production season and weather changes, timely medication, comprehensive prevention and treatment. In the use of drugs, a combination of drugs can achieve better control effects, such as good biosynthesis and chlorothalonil, good biosynthesis and sclerotium mixed use, have a better control effect on chrysanthemum black spot and blight. Some insecticides can also be mixed with bactericides, which can achieve the effect of both pests and diseases, and save manpower. In addition, the application of furandan granules in the potting soil of chrysanthemum has a long-term control effect on sucking pests. Linyi Fertilizer Network Copyright
Third, early medication, usually have to be diligent in observation. Once the signs of pests and diseases are discovered, the right medication can be achieved immediately, and often the drug effect can be achieved. Once neglected, when the pests are severely applied, it is often half the effort, and the chrysanthemum growth and ornamental value are greatly reduced. Linyi Fertilizer Network Copyright
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