Dose-response relationship between abamectin and mortality of Panonychus ulmi (Acari: Tetranychidae)

Ouassat, Said ; Allam, Latifa ; Ouahbi, Abdelilah ; Badaoui, Khalid EL; Allabou, Aziz


In this study, the dose-response relationship between abamectin and mortality of larval and adult forms of Panonychus ulmi (Koch) was established. Abamectin was investigated at a dilution series of 1/1, 1/1.15, 1/1.35, 1/1.6, 1/2, 1/2.55, 1/4, 1/8 and 1/16 of its field recommended concentration, in order to calculate the ECi – values. Results showed that the lowest ECi – values were observed on larvae, which showed high sensitivity to abamectin than adults. Both statistical models led to satisfactory findings and the linear model was ranked as the best model for describing the dose-response relationship. This research highlighted the importance of toxicity risk assessments to obtain a more accurate estimation of the compatibility of abamectin in the integrated pest management (IPM) programs


Abamectin; Effect concentration; Modeling; REGTOX Macro; Toxicity.

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