Sunn pest

Sunn pest (Eurygaster integriceps) is one of the most destructive pests of cereal crops, belonging to the order Hemiptera and the family Scutelleridae. This insect is a major threat to wheat and barley production throughout the steppe and forest-steppe regions, causing significant economic losses.

The pest primarily targets wheat, barley, rye, and oats. In the early spring, adults feed on winter cereal crops before migrating to spring-sown fields. The most severe damage occurs during the grain-filling and ripening stages, as the insects feed on the ears, severely affecting the yield and quality.

The life cycle of the pest involves one generation per year. Adults overwinter in leaf litter within forests or windbreaks. In spring, when temperatures reach approximately 12-15°C, they migrate to host crops. Females lay eggs on the undersides of leaves, and larvae emerge after one to two weeks, passing through five larval instars.

The damage is twofold: physical injury to stems and chemical degradation of the grain. Adults and late-instar larvae inject salivary enzymes into the developing grain. These enzymes break down the gluten proteins, rendering the wheat unsuitable for baking bread, even at low levels of infestation.

Management strategies require an integrated approach. Effective cultural methods include crop rotation, harvesting as early as possible, and deep plowing to destroy overwintering sites. Chemical control is implemented using insecticides when larval density exceeds the economic threshold, typically targeting the 2nd and 3rd larval instars.

• Practicing crop rotation to break life cycles.
• Implementing early harvesting techniques.
• Applying insecticides during the peak of larval development.
• Maintaining natural enemies to manage pest populations.