Leaf scald is a common disease that affects sugarcane plants. It is caused by a bacterium called Xanthomonas albilineans. Here are some symptoms of leaf scald that you should look out for in sugarcane:
- Chlorotic streaks: The first visible symptom of leaf scald is the appearance of chlorotic streaks or stripes on the leaves. These streaks are usually parallel to the leaf veins and start as narrow yellow lines that later turn white or straw-colored. The affected areas may extend along the entire length of the leaf.
- Leaf discoloration: As the disease progresses, the chlorotic streaks become more pronounced, and the affected areas become necrotic, turning brown or gray. The necrotic tissue may dry out and become brittle.
- Leaf drying and curling: Infected leaves may start to dry out, curl, and become twisted. They often exhibit a characteristic “fishhook” appearance due to the curling and bending of the leaf edges.
- Stunted growth: Severe leaf scald infections can lead to stunted growth of the sugarcane plants. Infected plants may exhibit reduced vigor, with shorter and thinner stalks compared to healthy plants.
- Reddish discoloration of leaf sheaths: In some cases, infected sugarcane plants may develop reddish discoloration on the leaf sheaths, particularly near the nodes. This symptom is more prominent in certain sugarcane varieties.
It’s important to note that leaf scald symptoms can resemble other diseases or physiological disorders, so it’s best to consult with a local agricultural extension service or plant pathologist for an accurate diagnosis if you suspect leaf scald in your sugarcane crop. Proper disease management practices, such as the use of disease-resistant varieties, sanitation measures, and cultural practices, can help prevent and control leaf scald in sugarcane.
