Evaluation of the efficiency of entomopathogenic fungi in controlling mustard aphids and promoting the growth of green cos lettuce
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Abstract
Entomopathogenic fungi (EPF) have significant potential as biological control agents for insect pests and as integral components of integrated pest management systems. This study assessed the efficacy of nine entomopathogenic fungal isolates in controlling mustard aphids under laboratory conditions. Among the isolates, NMMet_KTLS7/3 exhibited the highest mortality (88.89%) and infection rates (85.57%), which were significantly different from those of the other isolates (p<0.05). Additionally, NMMet_KBR5/1 demonstrated the highest phosphate solubilization index (PSI) of 1.54, comparable to NMMet_KTLS7/3 (1.49) and NMMet_LTMC3/3 (1.44). Green cos lettuce plants treated with soil drench applications of entomopathogenic fungi exhibited significantly enhanced growth parameters, including plant height, leaf number, leaf area, fresh weight, and dry matter content (p < 0.05). The total fresh weight (shoot+root), shoot weight, and root weight of lettuce treated with NMMet_KBR5/1 demonstrated significantly higher values compared to other EPF isolates, with values of 105.79 g, 87.40 g, and 14.47 g, respectively. These values were not statistically different (p > 0.05) from those treated with NPK fertilizer (116.05 g, 90.65 g, and 20.60 g, respectively). In conclusion, all nine EPF isolates controlled aphids, solubilized phosphate, and promoted lettuce growth. NMMet_KTLS7/3 and NMMet_KBR5/1 are recommended for further field evaluation.
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