Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Potential of Entomopathogenic Nematodes versus Alpha-cypermethrin Against Potato Tuber Moth, Phthorimaea operculella Zeller 1873 (Lep.: Gelechiidae) in Storage Conditions

Version 1 : Received: 21 February 2021 / Approved: 22 February 2021 / Online: 22 February 2021 (13:19:25 CET)

How to cite: Ebrahimi, L.; Sheikhigarjan, A.; Ghazavi, M. Potential of Entomopathogenic Nematodes versus Alpha-cypermethrin Against Potato Tuber Moth, Phthorimaea operculella Zeller 1873 (Lep.: Gelechiidae) in Storage Conditions. Preprints 2021, 2021020472 (doi: 10.20944/preprints202102.0472.v1). Ebrahimi, L.; Sheikhigarjan, A.; Ghazavi, M. Potential of Entomopathogenic Nematodes versus Alpha-cypermethrin Against Potato Tuber Moth, Phthorimaea operculella Zeller 1873 (Lep.: Gelechiidae) in Storage Conditions. Preprints 2021, 2021020472 (doi: 10.20944/preprints202102.0472.v1).

Abstract

The potato tuber moth PTM, Phthorimaea operculella, is one of the most economically important potato pests worldwide. In the present study, the potential of Steinernema feltiae and Steinernema carpocapsae for controlling PTM in potato tubers was evaluated compared to alpha-cypermethrin. Steinernema carpocapsae in both concentrations (12.6×106IJs and 6.2×106IJs) showed a lower number of emerged insects than alpha-cypermethrin (10 mg ai l-1). Alpha-cypermethrin (20 mg ai l-1) showed the highest efficacy against PTM (81.17%), S.carpocapsae (12.6×106IJs), and alpha-cypermethrin (10 mg ai l-1) showed similar efficacy (72.53%) while S. feltiae (6.2×106IJs) showed the lowest efficacy (39.04%). The results showed that S.carpocapsae in both concentrations and S. feltiae (12.6×106IJs) were efficient the same as alpha-cypermethrin (10 mg ai l-1) having no environmental and health adverse impacts issued in the chemical insecticides usage. Both concentrations of alpha-cypermethrin and S. carpocapsae showed the least tuber damage with no significant differences, while it was as high as the control (59.26%) in both concentrations of S. feltiae. This promising finding introduces EPNs as a part of the potato tuber protection program in storage. Accordingly, EPNs can be considered as an appropriate alternative to synthetic chemicals for PTM control without any residue and health problems.

Keywords

EPNs; PTM; biological control; potato tuber; efficacy; alpha-cypermethrin

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