Two-bristled gall midge

The two-bristled gall midge (Cecidomyia bisetosa) is an insect belonging to the order Diptera and the family Cecidomyiidae. This species is known in agricultural entomology as a specialized pest that specifically targets various cereal crops, posing a risk to yield quantity and quality in affected fields.

The primary hosts of this midge are graminaceous plants. By utilizing plant tissues for nutrition, the larvae disrupt the normal vascular function of the stems. This feeding behavior often leads to significant physiological stress in the host plants, hindering their ability to reach full maturity and resulting in stunted growth.

The biological cycle of Cecidomyia bisetosa is characterized by distinct developmental stages: egg, larva, pupa, and adult. The overwintering phase typically occurs in the larval stage, residing deep within the soil or protected by crop residue. As spring temperatures rise, the insects undergo pupation and emerge as adults to begin the cycle anew, synchronizing their emergence with the developmental stages of the host crops.

The damage caused by these insects is primarily systemic. Infestations lead to structural deformations, such as twisted or shortened stems, which often result in lodging of the crops. The economic impact is felt through reduced grain filling, lower overall harvest weight, and a general decline in the quality of the agricultural product.

Effective management requires an integrated approach. Cultural practices such as crop rotation, deep plowing to bury infested stubble, and consistent weed management are essential to reduce the population density of the midge. When infestations exceed established economic thresholds, targeted insecticide applications during the adult emergence phase can be highly effective in minimizing crop losses.