How to prevent and cure the spot blight of yam?
How to prevent and cure the spot blight of yam? Consult (pathogen name) Septoria diocoreae J.K. Bai & Lu (host crop) yam. (disease diagnosis) mainly damaged leaves. Leaf disease, the initial emergence of small brown spots on the leaf surface, and then gradually expanded into a size of 6mm to 10mm, polygonal spot. The edge of the spot is dark brown, the center is brown, and numerous small black spots are born. When the disease is serious, the leaves are covered with disease spots or disease spots are connected to each other, causing the diseased leaves to dry up and die. The pathogen is Alternaria alternata. The conidia of the pathogen were mainly foliar, scattered or aggregated, and broke through the epidermis after burial, spherical to subglobose, dark brown, conidia clavate, subcylindrical, obtuse at the base, obtuse at the top, straight or slightly curved, with 2 to 14 septum. The pathogen overwintered on the diseased body by conidia. In the following year, the overwintering conidia released conidia for primary infection and re-infection, and the conidia spread in the field by wind and rain. Bacteria like warm and humid conditions, high temperature and rainy conditions are conducive to the disease, especially Rain Water is very important for spore spread, germination and infection. (control measures) (1) the land with high topography and loose and fertile soil was selected for planting. (2) continuous cropping should be avoided in frequent and seriously diseased areas and should be rotated with food crops for more than 2 years. (3) adequate application of rotten manure. Increase the application of phosphorus and potassium fertilizer and avoid excessive application of nitrogen fertilizer. Reasonable irrigation and drainage after rain. (4) spraying medicament prevention and treatment in time at the initial stage of the disease, the medicament can choose 40% polysulfide suspension 500 times liquid, or 60% Fangmaibao ultra-fine wettable powder 800 times liquid, or 30% copper oxychloride suspension 600 times liquid, or 30% green leaf Dan wettable powder 600 times liquid, or 80% Wanlusheng wettable powder 800 times liquid, or 50% lide wettable powder 800 times liquid. Click to see more yam planting techniques click to see more vegetable planting techniques
- Prev
How to control diseases and insect pests in yam planting?
How to control diseases and insect pests after planting Chinese yam? The main disease and pest control methods of Chinese yam are introduced as follows: first, agricultural control 1. The selection of disease-resistant varieties is an effective method to control diseases and insect pests of yam. When cultivating disease-resistant varieties, the varieties should be rotated every 2 ~ 3 years, and attention should be paid to the purification and rejuvenation of the varieties. ...
- Next
How to prevent the deformity of yam?
How to manage in the later stage of planting Chinese yam? Which points should be paid attention to in the late management of planting Chinese yam? Experts remind as follows: ditch planting yam, timely cleaning of drains, timely drainage of rain to prevent ditches from collapsing. From early August to late September, combined with disease prevention and insect control, 0.2% potassium dihydrogen phosphate was sprayed on the leaves.
Related
- Where is it suitable to grow horseradish in China? it is expected to see the middle altitude horseradish in Alishan.
- How to prevent tomato virus disease reasonably? (Control methods included)
- Many people like to plant towel gourd on the balcony. What are the main points of this method and management?
- What crops can chili peppers be mixed with?
- Fertilization techniques and matters needing attention in Tomato
- What are the grafting techniques for peach seedlings in spring?
- Harm and control methods of root swelling disease of Chinese cabbage
- What are the pests of sweet potatoes? How to prevent and cure it?
- Symptoms, causes and Control methods of navel Rot in Tomato
- The cause of "Cucumber rotten bibcock" in Farmers' planting Cucumber and its Control Plan