Plant Protect. Sci., 2021, 57(4):326-332 | DOI: 10.17221/154/2020-PPS

Residue and dissipation dynamic of spinetoram insecticide in pear fruitsOriginal Paper

Dragana Šunjka*,1, Sanja Lazić1, Slavica Vuković1, Aleksandra Alavanja1, Đura Nađ1, Siniša Mitrić2
1 Department for Plant and Environmental Protection, Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
2 Faculty of Agriculture, University of Banja Luka, Banja Luka, Bosnia and Herzegovina

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 L1-L3 and L4-L5. Spinetoram has shown satisfying efficacy, especially in the control of L1-L3 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.

Keywords: spinosyne; pear psylla; DT50; pre-harvest interval; PHI

Published: September 26, 2021  Show citation

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Šunjka D, Lazić S, Vuković S, Alavanja A, Nađ Đ, Mitrić S. Residue and dissipation dynamic of spinetoram insecticide in pear fruits. Plant Protect. Sci. 2021;57(4):326-332. doi: 10.17221/154/2020-PPS.
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