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 affected plant was rotted, and the diseased area was generally 20-30 cm above the ground. 1 Harmful symptoms At the beginning of the disease, the cortex of the disease becomes rough, gradually becomes brown, amorphous wet rot, often flows out of the sap, and the diseased part reaches deep to the xylem. When the disease is hot and humid, the disease department rapidly expands to vertical and horizontal directions, causing the trunk, main root, lateral roots, and even fibrous roots. Decayed; the diseased part is dry and cracking and peeling when it is dry, and circumcision is severe when it is severe. 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 The disease conditions are likely to be caused by the high temperature in summer and autumn and the humidity in the orchard. 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 Prevention and Control Methods 1. Timely trenching drainage: 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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