Effect of three non cultivated plants on host preference and on oviposition rate of the potato tuber moth (Phthorimaea operculella).
Laboratory and the field tests indicated that the oviposition rate of Phthorimaea operculella (Zeller) on five cultivated host plants including potato, tobacco, tomato, pepper and egg-plant was not the same in both conditions. The highest oviposition rate of this insect was on the tobacco that was significantly different with those on the pepper in the laboratory and on the tomato in the field. Also, using leaf powder and 5% extract of three non-cultivated plants including Sambucus ebulus L., Artemisia annua L. and Pterocarya fraxinifolia on potato tubers showed that all of them reduced egg laying of the potato tuber moth. In general, the extracts of the 3 plants were more deterrant than their powder. Leaf powder and extract of P. fraxinifolia was most effective deterrant to females egg laying on potato tubers than the other two plants, A. annua and S. ebulus L.