Insecticidal Protection Effectiveness Reduces Pest Populations and Increases Spring Wheat Yield in Northern Kazakhstan Agroecosystems Study

Spring wheat productivity in Northern Kazakhstan is closely linked to the ecological stability of agroecosystems, where pest outbreaks significantly limit yield formation under favorable climatic conditions. This study aimed to evaluate the effectiveness of insecticidal protection in reducing pest abundance and increasing spring wheat yield within regional agroecosystems. Field microplot experiments were conducted in 2024 on the Aina cultivar under the conditions of the Akmola region. The treatments included lambda-cyhalothrin-based insecticide applied at rates of 0.075 and 0.1 L/ha, compared with an untreated control and a reference product. Pest populations were assessed before and after treatment, and grain yield was measured under standard agronomic conditions. The results demonstrated high biological efficiency of insecticidal application within the agroecosystem. At the 0.1 L/ha rate, pest suppression reached up to 98.7% for wheat thrips, 97.7% for flea beetles and leafhoppers, 96.2% for cutworms, and up to 100.0% for stem pests. Insecticidal protection led to yield increases of 3.4–3.7 c/ha (28.5–31.0%) compared with the control. No negative effects on non-target organisms or operator health were observed, indicating ecological safety under the studied conditions. The findings confirm the importance of targeted insecticidal protection for maintaining agroecosystem balance and enhancing the productivity of spring wheat in Northern Kazakhstan.