White silk disease of impatiens
Impatiens white silk disease harms plant roots and fruits, causing quenching, root rot, base rot and fruit rot. The disease can harm Iris, orchid, peony, peach, plum and other plants.
Symptoms: at the initial stage of the disease, brown-black wet rot occurred at the base of the susceptible plant, followed by white silk mycelium and sclerotia the size of rapeseed. In the later stage of the disease, the seriously susceptible plants were stunted.
Pathogen: the pathogen is Rhizoctonia uniformis (SclerotiumrolfsiiSacc.), which belongs to the subphylum Trichoderma, Trichoderma and non-spore order fungi.
Disease regularity: the pathogen could survive in the soil and plant residue for many years with mycelium and bacterial brown, and the mycelium invaded from the root and stem of the seedling.
Prevention and treatment: ① pulled out the diseased plants and destroyed the sclerotia in the soil. Spread lime in the acupoint, or disinfect the soil with 70% pentachloronitrobenzene powder and new soil (1purl 100). In the early stage of ②, the base of the diseased stem was irrigated with 50% carbendazim wettable powder or 50% topiramine wettable powder, once every 7-10 days, for a total of 2-3 times.
- Prev
Impatiens powdery mildew and brown spot
Powdery mildew symptoms: mainly harm leaves, flowers and stems can also be damaged. Round white mildew spots first appeared on the leaves of impatiens, which generally began to occur in May. After June, the disease spots expanded or multiple disease spots were connected into pieces, each layer thickened to form a white powdery mildew layer, and mildew layers could be produced on the front and back of the leaves. In early autumn, yellow dots were formed in the powder layer, and then gradually deepened and finally dark brown. In serious cases, the leaves died and fell early. Pathogen and occurrence regularity: the subphylum of atomic cysticercus, powdery mildew caused by monofilament. Son
- Next
Prevention and control of spot disease of impatiens
First, damage symptoms: disease scientific name: PhyllostictaimpatientisFautr. Impatiens spot disease is mainly harmful to leaves. Primary yellow spots, gradually expanding around into a round spot, the size of 2~5mm. The center of the post-plaque is light brown or grayish white, the edge is brown slightly raised,-dead black particles, that is, the pathogen conidium. If the bacteria invade from the leaf tip or leaf edge, the leaf tip will die and the leaf edge will be anxious. The disease occurred in Guangdong and Yunnan from July to September. 2. Morphological characteristics of pathogenic bacteria: pathogen is called Feng.
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