1PhD student of Biological Sciences, Laboratory of Production and Safeguarding of Endangered Species and Crops. Influence of Climatic Variations. Department of Biological Sciences and Agricultural Sciences. Mouloud Mammeri University, BP 17RP, Tizi-Ouzou, Algeria. E-mail: radialamara@gmail.com
2Doctor of Biological Sciences, Laboratory of Production and Safeguarding of Endangered Species and Crops. Influence of Climatic Variations. Department of Biological Sciences and Agricultural Sciences. Mouloud Mammeri University, BP 17RP, Tizi-Ouzou, Algeria. E-mail: kgoucem@yahoo.fr
3Doctor of environnemental engineering, Laboratory of Production and Safeguarding of Endangered Species and Crops. Influence of Climatic Variations. Department of Biological Sciences and Agricultural Sciences. Mouloud Mammeri University, BP 17RP, Tizi-Ouzou, Algeria. E-mail: nadiaalar@yahoo.fr
4Professor of Biological Sciences, Laboratory of Production and Safeguarding of Endangered Species and Crops. Influence of Climatic Variations. Department of Biological Sciences and Agricultural Sciences. Mouloud Mammeri University, BP 17RP, Tizi-Ouzou, Algeria. E-mail: medjdoubferroudja@yahoo.fr
*Corresponding Author: Radhia Lamara Mahamed-Allahoum. PhD student of Biological Sciences, Laboratory of Production and Safeguarding of Endangered Species and Crops. Influence of Climatic Variations. Department of Biological Sciences and Agricultural Sciences. Mouloud Mammeri University, BP 17RP, Tizi-Ouzou, Algeria. E-mail: radialamara@gmail.com
Online published on 8 January, 2020.
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 same growing conditions. Investigation results 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.
Oviposition, Phthorimaea operculella, population dynamics, Solanum tuberosum, varietal resistance
