Stenotaphrum gall midge

The Stenotaphrum gall midge (Stenodiplosis stenotaphri) is a specialized insect belonging to the family Cecidomyiidae within the order Diptera. These small flies are known for their impact on grass species, particularly those within the Stenotaphrum genus used in forage and turf production.

This pest specifically targets the reproductive organs of its host plants. By colonizing the spikelets, the midge ensures a steady food supply for its larvae, which directly affects the seed-bearing capacity of the grass crops.

The life cycle begins when adult females lay eggs into the developing inflorescences. Once the larvae emerge, they feed on the ovary tissues, which disrupts the normal seed development process. The larvae typically overwinter in the soil or crop debris, emerging in the following season to restart the cycle.

The damage caused by this midge is primarily economic, as it leads to seed sterility and significant yield loss. Affected spikelets often fail to produce viable seeds, which can undermine the efforts of seed producers and reduce the overall quality of the grassland or pasture.

Effective management requires an integrated approach to minimize the pest population:

• Implementing crop rotation to break the pest's reproductive cycle.
• Managing crop residues through tillage to destroy overwintering stages.
• Monitoring adult flight periods using pheromone or sticky traps.
• Applying targeted insecticides during the vulnerable flowering stages if economic thresholds are exceeded.