Black stem rot of geranium
Symptoms: the disease occurs on both cuttings and adult plants. The susceptible cuttings began to rot from the base of the stem, and gradually developed upward, resulting in death. After the onset of the adult plant, the diseased part became black, rotted, gradually developed upward, and finally the leaves fell off. when the disease was serious, the diseased part cut the stem around, resulting in the death of the plant.
Pathogen: the pathogen is gorgeous Pythium (PythiumsplendensBraun), which belongs to the subphylum flagellum, oomycetes, downy mildew and Pythium.
The law of disease: the pathogen survives in the soil as oospores. When the conditions are suitable, the oospores germinate and produce germ tubes to invade the host. Zoospores and zoospores are produced on susceptible hosts, and zoospores can be re-infected.
Prevention and treatment: ① in the disease-free seedling bed, the use of disease-free branches cutting. When ② is cultivated, it is necessary to change the new area or basin soil, and disinfect the soil if necessary.
- Prev
Prevention and treatment of mosaic disease (cmv) of geranium
The symptoms of the leaves are mosaic-like, the leaves are smaller than normal, and show uneven. Some varieties produce chlorotic spots and broken flowers. The pathogen is cucumber mosaic virus (CMV). The route of transmission is transmitted by sap and aphids. Prevention and control methods 1. In the process of management and operation, often use soapy water to wash and disinfect. 2. Timely control of aphids and eradication of surrounding weeds.
- Next
Prevention and treatment of black shank disease of geranium
The symptom of this disease occurs on both cuttings and adult plants, and the damage of cuttings is more serious, which begins to rot from the base of the stem, develops upward, and causes death. After the onset of the disease, the adult plant turned black and expanded upward, and the leaves fell off, so that the whole plant withered and died. The pathogen Pythium ornate [PythiumsplendensBraun] belongs to the subphylum flagellum. The hyphae are well developed, branched, without septum, and show white cotton floc shape when the growth is exuberant. The sporangia are filamentous, round or subrounded, producing zoospores and causing infection.
Related
- Fuxing push coffee new agricultural production and marketing class: lack of small-scale processing plants
- Jujube rice field leisure farm deep ploughing Yilan for five years to create a space for organic food and play
- Nongyu Farm-A trial of organic papaya for brave women with advanced technology
- Four points for attention in the prevention and control of diseases and insect pests of edible fungi
- How to add nutrient solution to Edible Fungi
- Is there any good way to control edible fungus mites?
- Open Inoculation Technology of Edible Fungi
- Is there any clever way to use fertilizer for edible fungus in winter?
- What agents are used to kill the pathogens of edible fungi in the mushroom shed?
- Rapid drying of Edible Fungi