Sugarcane grassy shoot

Sugarcane grassy shoot is a devastating disease caused by phytoplasmas, which are small, wall-less bacteria residing in the phloem of the host plant. This systemic pathogen disrupts normal growth hormones, resulting in severe developmental abnormalities.

The primary host for this disease is sugarcane, although related grasses can also act as reservoirs for the pathogen. The damage to the agricultural industry is significant, as infected crops show reduced stalk height, diameter, and overall sugar content, leading to major economic losses.

The most distinctive symptom is the appearance of numerous thin, pale, grass-like shoots originating from the base of the plant. This excessive tillering gives the plant a "grassy" appearance, while the leaves often show chlorosis and the stalks remain stunted and weak.

Transmission occurs through two main routes: the use of infected setts (cuttings) for propagation and the activity of insect vectors, primarily leafhoppers. The spread of the disease is most rapid in regions with warm, humid conditions that favor insect reproduction.

• Utilizing only healthy, disease-free seed canes for planting.
• Implementing hot water treatment for cuttings to eliminate phytoplasma.
• Applying systemic insecticides to manage the population of insect vectors.
• Rogueing or removing infected plants as soon as they are identified.

Integrated disease management is essential to minimize the impact of grassy shoot. Since there is no chemical cure for phytoplasma infections once established in the plant tissue, prevention through rigorous field inspections and hygiene practices remains the best strategy for producers.