Population Dynamics of the Potato Tuber Moth Phthorimaea operculella Zeller (Lepidoptera: Gelechiidae) Upon Different Potato Varieties Grown in Northern Algeria

Abstract

Monitoring of population dynamics, varietal resistance and oviposition (depending on the foliar side and plant foliar layer) of the potato tuber moth Phthorimaea operculella Zeller were studied in the field, upon four potato varieties: Spunta, Kenza, Crisper and Désirée cultivated under the Investigation same results growing conditions. showed a positive correlation between flight of P. operculella adults and the increase in temperatures recorded from April to May 2016. A significant difference (P = 0.02) appeared between the four varieties for the number of males caught by pheromone traps; potato tuber moth showed a marked preference for the Spunta variety with an average of 6±1.46 adults per trap. Oviposition of potato tuber moth females was significantly higher on the lower sides of potato leaves compared to the upper sides, excepted for the Crisper variety where recorded differences were not significant (P = 0, 07) . Egg density laid upon the foliage did not show significant differences between the plant foliar layers (upper, middle and lower) in all the varieties studied. Combined with appropriate cultural practices and the rational use of chemical control, potato varietal resistance to P. operculella could be an essential tool in IPM programs for this pest insect.