DISSIPATION OF CYFLUMETOFEN IN STRAWBERRY FRUITS AND GREEN BEAN PODS UNDER GREENHOUSE CONDITIONS USING QUECHERS METHOD AND GC/(μ-ECD)

Strawberry and green bean are important cash crops. Both are highly infected by different pests under greenhouse conditions causing reduction in quality and yield. Mites are usually from the most common pests of beans and strawberries. Field experiment was carried out to investigate dissipation of Cyflumetofen (a novel acaricide) in strawberry fruits and green bean pods. Determination was done using quick, easy, cheap, effective, rugged, safe (QuEChERS) method and cleanup step utilizing dispersive solid-phase extraction (DSPE) followed by gas chromatography coupled with a micro electron capture detector GC/(mu-ECD). Average recoveries were within 80.75-92.15% and 80.86-82.91%, with relative standard deviations (RSDs) ranging from 2.8 to 6.6% and 3.59-4.70%. in strawberry and green bean samples, respectively at spiking levels (0.01 - 1 mg/kg). Linearity was achieved for Cyflumetofen with correlation coefficient R-2 > 0.98 and matrix-matched calibration also showed linearity with determination coefficients R-2 > 0.98. The initial deposits in strawberry fruits and green bean pods were 2.48 and 3.24 mg/kg, respectively. The half-life period (RL50) in strawberry fruits and green bean pods was 1.81 and 1.16 days, respectively. According to maximum residue level (MRL) which is 0.6 mg/kg, the pre-harvest interval (PHI) was estimated to be 3 days in strawberry fruits.