Sorghum shoot fly

The sorghum shoot fly (Atherigona varia) is a member of the Muscidae family within the order Diptera. It is recognized as one of the most critical pests affecting cereal production, particularly in warm, tropical, and subtropical regions where sorghum is a staple.

The pest primarily targets sorghum, but it also infests maize, pearl millet, sudan grass, and various wild grasses. The damage is most severe during the seedling stage, typically between the emergence of the first leaf and the five-leaf stage, before the plant develops sufficient tillering.

Regarding its biology, the adult female lays eggs on the undersides of leaves. Upon hatching, the larvae crawl to the leaf whorl and penetrate the stem, moving downwards to the growing point. They feed on the decaying tissue, causing the central shoot to wither and die.

The characteristic damage symptom is known as «dead heart,» where the central leaf turns yellow and dries up while the outer leaves remain green. Infested plants may produce lateral tillers to compensate, but these often yield poorly compared to healthy, undamaged plants.

Effective management strategies rely on an integrated approach. Farmers should prioritize early sowing to ensure plants pass the susceptible stage before pest populations peak. Seed treatment with systemic insecticides is the most effective preventative measure, supplemented by chemical sprays if threshold levels of infestation are observed in the field.