Bacterial leaf stripe

Bacterial leaf stripe, caused by the phytopathogenic bacterium Paraburkholderia andropogonis, is a significant agricultural disease affecting various monocot crops. This bacterial infection is characterized by systemic or localized damage to foliage, which can substantially impair the plant's photosynthetic capacity and overall vigor.

Sorghum is the primary host for this pathogen, although it is also known to affect corn and sugarcane. The disease persists in infected plant debris, soil, or seeds, making it a recurring challenge for farmers who do not implement rigorous sanitation and crop rotation programs in their management practices.

The visual symptoms typically appear as elongated, narrow, tan-to-reddish brown stripes running parallel to the leaf veins. Over time, these stripes may coalesce into large, necrotic patches. In severe cases, the lesions cause the leaves to wilt prematurely, leading to reduced grain yield and lower biomass quality in affected fields.

Environmental conditions play a critical role in the development and spread of P. andropogonis. The disease thrives in warm, humid weather where leaf wetness persists for extended periods. Rain-splashed soil and overhead irrigation are primary mechanisms for spreading the bacteria from infected residue to the canopy of healthy plants.

Management of bacterial leaf stripe relies heavily on integrated preventive measures, as chemical control options are limited and often ineffective once the infection is established. Key strategies include:

• planting resistant or tolerant varieties;
• using pathogen-free, certified seeds;
• implementing deep tillage to incorporate crop residues;
• maintaining extended crop rotations to reduce inoculum levels in the soil.