Study on the Effects of 12% Amino Acid+1% Cyantraniliprole Pesticide-fertilizer on Maize Growth and the Control of Spodoptera frugiperda

【Objective】To address the challenges of frequent field operations and intensive labor demands caused by separate fertilizer and pesticide applications in maize cultivation, this study developed an integrated pesticide-fertilizer formulation combining nutrient delivery and pest management functions, aiming to achieve synchronized agrochemical application through a single operational procedure.【Method】A 12% amino acid and 1% cyantraniliprole pesticide-fertilizer solution was prepared; Using the fresh-eating maize variety 'Yuetian 28' as test material, field plot trials were conducted in Guangzhou and Dongguan with four treatments: sole application of 12% amino acid water-soluble fertilizer (A1); application of 12% amino acids+1% cyantraniliprole pesticide-fertiliser (A2); sole application of 10% cyantraniliprole OD (A3); clear water control (CK). Root drenching was performed during the four-leaf stage of maize. The damage caused by Spodoptera frugiperda was regularly investigated under each treatment condition, and the growth of maize was measured 30 days later.【Result】In terms of plant height, leaf length, leaf width, and stem diameter, the results showed that A1 ≈ A2 > CK ≈ A3, with the most significant increase in stem diameter: in the Guangzhou test area, A1 treatment group had a 46.4% increase in stem diameter compared to CK. In the Dongguan experimental area, the stem diameter of A1 treatment group and A2 treatment group increased by 28.6% and 31.3% respectively compared with the CK group. A2 treatment also had advantages in promoting maize biomass accumulation. Except for the underground dry weight in the Guangzhou test area, the fresh weight and dry weight of the above-ground and underground parts of maize were significantly higher than those of the CK and A3 treatment group. In terms of root system metrics, there was no significant difference between the A2 treatment group and A1 treatment group in most indicators. A2 treatment group outperformed the CK and A3 treatment group in all root indicators in all test areas, with increases ranging from 7.8% to 57.6% (Guangzhou) and 1.4% to 30.5% (Dongguan). In terms of prevention effectiveness, A2 treatment group showed a 6.5% to 31.2% (Guangzhou) and 4.5% to 19.4% (Dongguan) increase in prevention effectiveness compared to A3 treatment group. The maximum prevention effectiveness of A2 treatment group reached 96.3% and 98.2% in the two locations, respectively, and the prevention effectiveness remained above 50% after 20 days, demonstrating a long-lasting effect.【Conclusion】The 12% amino acid+1% cyantraniliprole fertilizer-pesticide enhanced maize growth indicators while improving control efficacy against S. frugiperda, effectively reducing pest occurrence and providing practical insights for simplified maize cultivation and eco-friendly pest management.