Black wheat sawfly

Systematic position: The black wheat sawfly (Dolerus tritici) belongs to the order Hymenoptera, family Tenthredinidae. This insect is a recognized agricultural pest that specializes in various cereal crops, often causing localized outbreaks in fields with dense vegetation and favorable climatic conditions.

Host crops: The primary host range for Dolerus tritici includes winter and spring wheat, rye, barley, and oats. The larvae are capable of causing damage to these cereal crops from the seedling stage until the plants reach the booting phase, often thriving in areas where cereal production is practiced intensively.

Biology and life cycle: Adult sawflies emerge in the early spring, coinciding with the tillering stage of the host plants. Females lay eggs inside the leaf tissues. The larvae, also known as false caterpillars, feed primarily at night and hide in the soil or at the base of the stems during the day. The species completes one generation per year, overwintering as pre-pupae in cocoons deep within the soil.

Damage and pest status: The larval stage causes significant economic loss. Larvae feed on leaves, leading to skeletonization, or bore into the stems, disrupting nutrient flow. A severe infestation can result in stunted growth, withered foliage, and a direct decrease in kernel weight and overall grain quality at harvest time.

Control measures: Management of the black wheat sawfly relies on integrated agricultural practices and targeted chemical interventions:

• Deep tillage in the autumn to destroy pupation chambers in the soil.
• Crop rotation to break the pest's reproductive cycle.
• Removal of grassy weeds that serve as alternative hosts during off-seasons.
• Application of approved insecticides at the onset of larval hatching when economic thresholds are reached.