Evaluation of Bacterial Strains as a Sustainable Approach for Control of (F.) (Hemiptera: Aphididae) Under Laboratory and Field Conditions.

This study aims to evaluate the insecticidal activity of four bacterial strains against under both laboratory and field conditions, in order to provide a more sustainable and eco-friendly alternative to chemical insecticides. Four environmentally friendly bacterial strains were evaluated for their potential as biocontrol agents: (FD-1), (FD-63), subsp. (FDP-8), and subsp. (FDP-41). Experiments were conducted under both controlled laboratory and field conditions. Data showed that mortality rates ranged from 33.33% to 93.33% under controlled conditions and from 13.33% to 50% under field conditions over the 96 h period. subsp. (FDP-41) and subsp. (FDP-8) were the most effective bacterial strains against the aphids in controlled conditions. The percentage of mortality related to these applications was 93.33% and 80% in 96 h under laboratory conditions. However, the effectiveness of subsp. (FDP-41) was 50% at 96 h in the field. These findings suggest that subsp. and subsp. hold significant potential as biological control agents against . Additionally, FDP-41 showed the lowest LT value of 25.37 h in the laboratory and 86.40 h in the field. This indicates a much more rapid and potent effect on compared to other strains. As a result, it was concluded that these bacterial strains may be used successfully as biocontrol agents in the biological control of . Their successful use could reduce reliance on synthetic insecticides, thereby minimizing pesticide residues on crops and contributing to safer agricultural production and environmental sustainability.