Caragana leaf spot is a common disease that primarily affects the leaves of the plant. The symptoms begin with small red spots on the foliage, which are often surrounded by yellowish circles. As the disease progresses, these spots expand and may eventually lead to holes in the leaves, causing them to fall prematurely. This can weaken the tree and reduce its overall health if left untreated.
To effectively manage Caragana leaf spot, it's essential to focus on improving the tree's overall health. This includes proper fertilization, especially with organic matter, and regular pruning to promote air circulation and reduce humidity, which helps prevent fungal growth. A key strategy is to protect new leaves during their development phase. Applying fungicides such as a 1% Bordeaux mixture or a 70% thiophanate-methyl solution diluted to 700–800 times is recommended. Adding a new high-fat film can enhance the effectiveness of the treatment. Spraying should be done once when new leaves start to appear, and then repeated every 7–10 days for up to three applications. This approach has proven effective in controlling the spread of the disease. (Source: China Plant Protection Network - Wei Linfei)
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