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Potato tuber moth [Phthorimae operculella Zeller (Lep.: Gelechiidae)] is the most important insect causing damage of potatoes. It also causes significant damage to tomato and eggplant. The application of plant extracts to control insects is an effective alternative. In this study, the efficacy of extracts from Leptospermum petersonii Bailey (Myrtaceae), Achillea wilhelmsii C. Koch (Asteraceae) and Tanacetum parthenium L. (Asteraceae) on potato tuber moth using two different methods was investigated. Bioassays were used to determine the effect of varying concentrations (for L. petersonii 0.05%, 0.1%, 0.3% and 0.4%, for A. wilhelmsii and T. parthenium 1%, 3%, 6% and 12%) of extracts. Experiments were carried out using potato tuber of Solanum tuberosum L. Fourth instar larva of about were used in tuber dipping and larvae dipping methods. In tuber dipping method, the highest mortality (100%) occurred at concentration of 0.4% while the smallest mortality was at 0.05% the extracts of L. petersonii. It was determined that the extract of A. wilhelmsii and T. parthenium had the highest mortality at the highest concentration 85% and 90% respectively. In larva dipping method, the extracts of L. petersonii. A. wilhelmsii and T. parthenium showed the highest mortality at the highest concentrations 100%, 82% and 87% respectively. The research was undertaken under laboratory conditions at the Plant Protection Central Research Institute.

Insecticidal Effect of Three Different Plant Extracts on Potato Tuber Moth (Phthorimaea operculella Zeller (Lep.: Gelechiidae))