Field efficacy trials determined that flonicamid was more effective than spiromesifen and the negative control compound acetamiprid against Aphis craccivora Koch on faba bean, Vicia faba L. Flonicamid and spiromesifen residues in bean tissue and in soil were determined with high-performance liquid chromatography and gas chromatography-mass spectrometry. Using a spike level of 0.1–1 mg/kg, the recovery of flonicamid from bean tissue was 89.2% and from soil 81.4%. Spiromesifen recovery was 99.4% from bean and 90.3% from soil. The relative standard deviations ranged from 2.54 to 8.14%. According to the dissipation kinetics, the half-life of flonicamid residue in beans was 1.93 d and 1.96 d in soil, while that of spiromesifen in beans was 2.35 d and in 2.59 d in soil.

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Author notes

2

Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, 12613 Giza, Egypt.

3

Department of Biology, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.

4

Plant Protection Institute, Centre for Agricultural Research, 1022 Budapest, Hungary.