Cinnamon Disease Common Problems
In the golden autumn, the osmanthus is fragrant, but the yellow spots and dry edges on the leaves often plague planters. As one of the top ten traditional famous flowers in China, osmanthus has high requirements for the growing environment. Its common diseases not only affect the ornamental value but can also lead to plant death in severe cases. This article deeply analyzes the characteristics of three typical diseases and systematic control measures through three sets of real-shot comparison photos.
Illustration of Symptoms of Three Typical Diseases
Key Points for Identifying Brown Spot Disease
High incidence from late spring to early autumn (April-October), initially presenting as needle-like yellow spots, which expand into circular plaques within 3-5 days. The typical feature is a concentric ring pattern, with a 2mm wide yellow halo surrounding the outside and a gray-brown center resembling a cigarette burn. Special attention should be paid to the爆发 after rain in high-temperature environments.
Pattern of Development for Dry Spot Disease
Common in the transition period between summer and autumn (July-November), first appearing at the leaf edges and tips. Initially, it is a light brown streak, which forms irregular dead areas after 7 days, with clear deep brown edges and wavy patterns at the boundary between healthy and diseased parts. In severe cases, the entire leaf will become crispy and curl up.
Special Characteristics of T-J Disease
High incidence during the plum rain season (April-June), different from the annular sunken spots of the former two, it presents as light brown greasy spots. The most recognizable feature is that under humid conditions, the lesion surface will produce pink gelatinous material (conidial piles), which can be confirmed with a magnifying glass.
Four-dimensional Stereoscopic Control System
Key Points for Environmental Regulation
Choose humus soil with a pH of 5.5-6.5, and for potted plants, ensure a 3-5cm layer of ceramsite at the bottom for drainage. It is recommended to maintain a plant spacing of 1.5 times the crown width to ensure air circulation. Apply bone meal + decomposed cake fertilizer (3:1 ratio) every March to enhance plant resistance.
Physical Control Measures
Establish a disease calendar: conduct a full-plant check on the 15th of each month and remove diseased leaves immediately. After the autumn leaves fall, wipe the branches with 75% alcohol and paint the main stem 30cm high with a mixture of quicklime and sulfur powder (5:1).
Chemical Control Strategies
Alternately use Bordeaux mixture (copper ion disinfection) and difenoconazole (systemic therapy) at the initial stage of the disease, once every 7 days for 3 times. For severe cases, use a combined plan of drenching and spraying: first, water with 3000 times the solution of hymexazol, and after 2 hours, spray the leaf surface with 1500 times the solution of prochloraz.
Seedling Quarantine Standards
Newly purchased seedlings must be soaked in a potassium permanganate solution (1000ppm) for 30 minutes, focusing on the root junctions. After transplanting, isolate and observe for 20 days, during which spray with mancozeb protectant once a week.
By establishing a closed-loop management system of prevention-diagnosis-control, the incidence of osmanthus diseases can be significantly reduced. It is recommended to develop a control calendar based on the phenological period, for example, focusing on preventing T-J disease during the germination period and preventing brown spot disease during the bud differentiation period. Only by combining cultivation management with scientific medication can the cinnamon trees remain green throughout the year and full of fragrance in the golden autumn.
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