Rotten foot disease, also known as foot rot, is a disease that has become increasingly serious in recent years in litchi and longan orchards. The bark of the main stem of the damaged plant is rotted, and the diseased area is generally 20-30 cm from the ground.
1 hazard symptoms
In the early stage of disease, the cortex of the diseased area becomes rough, gradually becomes brown, amorphous wet rot, often flows out of the sap, and the diseased part reaches deep into the xylem. When the temperature is high and humid, the diseased part rapidly expands to the vertical and horizontal direction, causing the trunk, main root, lateral roots, and even fibrous roots to rot; When the disease is dry and cracking, peeling, severe circumcision. After the plants are damaged, some of the leaves turn yellow and fall off easily. The deciduous branches are easy to dry. Serious diseases often cause early flowering of fruit trees, less fruiting, and smaller and more acidic fruits. If the diseased area surrounds the trunk for a week, the upper leaves become severely yellow and the branches are dried up. The whole plant died.
2 disease conditions
In the summer and autumn high temperature, orchard humidity conditions, it is easy to cause the disease. Closely planted orchards, overgrown plants, overgrown weeds, orchards with poor drainage, low waterlogging, or water accumulation are generally more serious. The main stem stems from wounds due to pests or cultivation and other reasons, increasing the chance of pathogen invasion, and often aggravating the disease.
3 control methods
1. Ditching drainage in time: For orchards with low waterlogging, high groundwater level, and frequent flooding, the drainage ditch should be dug in time to prevent the accumulation of water in the soil. Loose soil weeding and fertilization, increased farm manure or bran fertilizer, and phosphorus and potassium fertilizers, to keep loose and dry, to the root system to grow, enhance tree vigor.
2. Reasonable sparse cutting: combining the fruit tree's plastic pruning, reasonable thinning of the dense branches, shade blocking branches, cutting away the branches of pests, weak branches, pendulous branches, dead branches, making the crown of the fruit trees airy and transparent, and fostering a healthy result. To thrive and increase the tree's resistance to diseases.
3. Strengthen pest control: In order to harm the main stem of the hornbill and single-horned rhinoceros adults, during the active period of pests, artificial killing is adopted, or 48% of the Loessben 800 times liquid is regularly sprayed on the main stem base to kill adult worms and refuses. Avoid eating. Before the larval larvae have yet to drill into the trunk, they are sprayed with 52.25% of farmland 1000 times liquid or l0% of Dagongchen 2000 times liquid to protect the trunk. For trunks that have been bitten by insect pests, drilled, and ploughed or girdled (ring-cut) trunks, promptly mix 50% carbendazim 500 times solution with yellow mud and apply dry protection to avoid wounds. Bacteria infestation.
4. drug treatment: the emergence of diseased trunk, the Department of rough skin first scraped, and then cut a number of longitudinal slits, deep to the xylem, and then coated Bordeaux mixture 1:1:10, or with 12% green copper 300 Dilution or 53.8% can kill 500 times the liquid mixture of yellow mud mix paste treatment, every 15 ~ 20d coated once, once every 3 or more times until the symptoms disappear. The canopy, the inner litchi stem and the tree tray were sprayed with 40% extinction 400 times liquid, or 58% thiram Mn-zinc 700 times, or 64% antiviral 600 times, eliminating bacteria and promoting healthy growth.
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