Cognac disease, also known as leaf tip blight, is a common fungal infection that affects bamboo plants, particularly on the tips of their leaves. This disease primarily targets the middle and lower leaves, causing noticeable damage over time. Initially, small yellowish lesions appear at the leaf tips and gradually spread inward. As the infection progresses, the affected areas turn a pale yellow color and become sunken. A distinct brown margin forms between the healthy and diseased tissue, and in later stages, small black spots—resembling fruiting bodies of the pathogen—may develop.
Infected leaves often die completely, while the middle portions of the leaves may only show dead tips. The causative fungi can persist on infected leaves or on fallen debris, making the disease more likely to occur after heavy rainfall or during periods of high humidity. Proper management is essential to prevent the spread of the infection.
To control the disease, it's important to promptly remove and destroy any infected leaves. In the early stages, spraying with a 1:1:100 Bordeaux mixture is effective. Alternatively, a 53.8% wettable powder formulation can be applied at a dilution of 1,000 times, or 10% water-dispersible granules can be used at a rate of 3,000 times. For smaller infestations, cutting off the affected parts of the leaves and applying a dacronine ointment to both sides of the cut area can help prevent further spread and recurrence of the disease. Regular monitoring and timely intervention are key to keeping the bamboo healthy and disease-free.
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