Residue and dissipation dynamic of spinetoram insecticide in pear fruits

https://doi.org/10.17221/154/2020-PPSCitation:

Šunjka D., Lazić S., Vuković S., Alavanja A., Nađ Đ., Mitrić S. (2021): Residue and dissipation dynamic of spinetoram insecticide in pear fruits. Plant Protect. Sci., 57: 326–332.

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Cacopsylla pyri (Linnaeus, 1758) is the most significant and widespread pear pest. It attacks the pear only, causing direct and indirect damages. This study was conducted in order to evaluate the efficacy of insecticide spinetoram in the control of C. pyri. The experiment was set up according to EPPO methods, at the locality Kula (Republic of Serbia) in a pear orchard (Williams variety). Spinetoram (250 g/kg a.i., WG) was foliar applied in the amount of 0.3 kg/ha, during overlapping pest generations, when pear was on BBCH 75 scale. The efficacy was evaluated through the number of larvae aged L1L3 and L4L5. Spinetoram has shown satisfying efficacy, especially in the control of L1L3 larvae (81.6%). In a dissipation study, spinetoram residues in pear fruits were determined using QuEChERS method followed by HPLC-DAD. The method was validated to fulfill SANTE/12682/2019 criteria. Three days after the application, spinetoram residues in pear fruits were below the MRL (0.2 mg/kg). The results have shown that spinetoram dissipation pattern followed the first-order kinetics (R2 = 0.979) with a half-life of 2.17 days, in pear fruits. This study suggests that spinetoram could be safely used in pear, and it could take an important place in insecticide resistance management.

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