SYMPOSIA PAPER Published: 23 February 2016

Adjuvant Improves Performance of Abamectin Against Spider Mites in Cucumbers


Spider mites (Tetranychus urticae) can attack a wide range of plants. Their infestation of cucumbers (Cucumis sativus) may create a serious problem for growers. Abamectin (VERTIMEC®) is one of the acaricides used for control of spider mites. Addition of an emulsifiable and esterified canola oil (Hasten NNP) to abamectin resulted in 90 % control of mites at 14 days after the third treatment. Without the adjuvant, control was 8 % on average. Analysis of the foliar absorbed abamectin demonstrated that the oil adjuvant increased the foliar uptake of abamectin 10-fold on average. Analysis of the abamectin present on and in the cucumber fruits demonstrated that the maximum residue limit (MRL) was not exceeded by the addition of the oil adjuvant. Addition of the adjuvant did not result in any phytotoxicity symptoms or in visible spray residues on the leaves. We believe that the oil adjuvant (Hasten NNP) substantially improves the robustness of abamectin performance against spider mites in cucumbers.

Author Information

Ruiter, Hans de
SURfaPLUS R&D B.V., Wageningen, PD, NL
Geuijen, Mark
Botany B. V., Meterik, NC, NL
Hof, Lysbeth
SURfaPLUS R&D B.V., Wageningen, PD, NL
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Developed by Committee: E35
Pages: 33–41
DOI: 10.1520/STP158720150005
ISBN-EB: 978-0-8031-7620-1
ISBN-13: 978-0-8031-7619-5