ABSTRACT

Effect of recommended dosage of Lambada -cyhalothrin against different stages of whitefly, Bemisia tabaci (Genn), on late summer tomato crop was evaluated. The results showed that Lambada -cyhalothrin reduced the whitefly infestation percentages by 823,83.1 and 83.8 in season 2006 and 83.7,82.0 and 82.8 in season 2007 for adult, immature and egg stages, respectively 7 days after treatmen. Lambada -cyhalothrin residues in tomato fruit reached 0.002 rag/kg. This amount of residues was found below the tolerance level (0.005 mg/kg) and no hazardous effects are expected when tomato fruit are consumed. It was found that the tested washing solutions such as potassium permanganate (0.02%), detergent 2%, sodium chloride 2% and acetic acid 2% removed Lambada -cyhalothrin residues on and in tomato fruit to reach below tolerance level The concentrations and removal percentage of Lambada -cyhalothrin residue were found to be 0.03 mg/kg and 98.6% for potassium permanganate solution 0.017 mg/kg and 992% for detergent solution 0.011 mg/kg and 99.5% for sodium chloride solution and 0.019 mg/kg and 99.1% for acetic acid solution (2%).

Key words: Lambada-cyhalothrin residues; Tomato; B. tabaci; Food safety.