How to Prevent and Treat Jasmine Branch Withering Disease
Jasmine, a common ornamental flower in courtyards and balconies, is loved for its fresh and fragrant aroma. However, the branch withering disease, a fungal disease, often causes the withering of branches and leaves, severely affecting the plant's growth and ornamental value. This article will provide a comprehensive analysis of the disease identification and systematic prevention measures for jasmine maintenance and disease prevention.
In-depth Analysis of Jasmine Branch Withering Disease
Three Stages of Symptom Development
In the early stage, the plant's growth slows down, new leaves wilt and droop, and dark red streaks appear on the epidermis of the branches. In the middle stage, the lesions spread to the entire branch, forming a brown annular necrotic band, and the leaves lose water and curl. In the later stage, the branches become completely lignified, with the surface densely covered with black conidia apparatus that can easily fall off when touched.
Four Elements of Pathogen Spread
The Fusarium pathogen is spread through splashing irrigation water, and heavy soil easily accumulates water to form a breeding ground for mycelium. At an average daily temperature of 20-28°C, the germination rate of spores increases by 85%, and the cross-infection rate of pruning tools reaches 60%. Poorly ventilated environments accelerate the spread of the disease.
Jasmine Disease Prevention and Maintenance System
Three Elements of Environmental Control
① Use a mixture of ceramic pots and perlite (30% proportion) as the growing medium to ensure a drainage porosity greater than 40%. ② Maintain 4-6 hours of sunlight per day, avoiding west-facing sunburn. ③ Set up bamboo supports to improve ventilation, with a plant spacing of more than 15cm.
Golden Ratio of Nutrient Management
Apply N-P-K=15-10-20 water-soluble fertilizer monthly during the growing season, and add potassium dihydrogen phosphate foliage fertilizer (diluted 800 times) during the flowering period. Before stopping fertilization in winter, supplement with decomposed sheep manure organic fertilizer (200g/pot) to enhance disease resistance.
Chemical Control Cycle Plan
In the early stage of the disease, alternate the use of 50% methylthiophanate 800-fold solution (highly penetrable) with 25% pyraclostrobin suspension 1500-fold solution (long-lasting effect), with a 7-day interval, focusing on the base of the branches. Combine with 80% mancozeb 600-fold solution for root irrigation, forming a three-dimensional protection.
Jasmine Annual Maintenance Tips
In spring, prune heavily, removing 70% of the old and weak branches; set up a rain shelter before the plum rain season; apply potassium fertilizer in autumn to increase lignification; and during winter cleaning, use a 30-fold solution of lime sulfur to disinfect the entire garden. Establish a maintenance log, recording each pruning, fertilizing, and spraying time for precise management.
By improving the cultivation environment, strengthening plant resistance, and using scientific medication, combined with seasonal maintenance points, the spread chain of the branch withering disease can be effectively blocked. It is recommended that jasmine enthusiasts inspect the entire plant every half month, immediately cut off diseased branches 2cm below the healthy part with a disinfected scissor, and continue to observe for two growth cycles to completely control the disease.