www.tjprc.org editor@tjprc.org POPULATION DYNAMICS OF THE CODLING MOTH CYDIA POMONELLA (LEPIDOPTERA: TORTRICIDAE) ON TWO APPLE VARIETIES IN ALGERIA GUERMAH DYHIA & MEDJDOUB-BENSAAD FERROUDJA Production Laboratory, Protect Endangered Species and Crops, Department of Biology Animal and Plant, Tizi Ouzou, Algeria ABSTRACT This study focuses on the biology of codling moth Cydia pomonella as well as the estimated damage caused by the pest on apple varieties Anna and Golden delicious in the region of Tizi-Ouzou. The male capture method using sex pheromone traps demonstrated the existence of 3 generations. The method of capture by traps strips provided information on a large number of diapausing larvae. The damage caused by this pest varied from a variety to another. Golden delicious variety presented higher infestation rates, due to caterpillars of the third generation that caused the fall of attacked fruits. KEYWORDS: Cydia pomonella, Apple Tree, Anna, Golden Delicious and Tizi-Ouzou Received: Jan 30, 2016; Accepted: Feb 22, 2016; Published: Feb 29, 2016; Paper Id.: IJBRDAPR20161 INTRODUCTION The codling moth Cydia pomonella (Lepidoptera: Tortricidae) is a key enemy of apple orchards in the world and can damage almost any culture if it is not mastered (Knoscfield, 2000). It is considered as a major pest in all producing regions in the world, and constitutes a permanent part of the natural fauna apple (Coutin, 1960). To fight against this pest only a chemical control and using of pheromone traps are applicated. The use of pesticides in agriculture represents a significant danger to human health and the environment accompanied with the development of pest resistance phenomena. In Algeria, damages caused by the codling moth were noted for the first time in Tlemcen in 1930 by Delassus et al. confirmed by Frezal 1939; the Batna region has registered a percentage of damage of 18.9% caused by the pest C. pomonella during 2007 (DSA). The objective of our study is to identify aspects of the codling moth bio ecology C. pomonella and to estimate the damage caused by this pest in the Tizi-Ouzou region upon two apple varieties Anna and Golden delicious. MATERIALS AND METHODS Our study was conducted in two fields, which are represented by Anna variety in the plot I and Golden delicious in plot II, in the region of Tizi-Ouzou (36° 43 00 North et 4° 03 00 Est) in Algeria witch characterized by a Mediterranean climate with mild winter on temperate floor bioclimatic. Sexual Trapping of Adults Attractive sex pheromone traps were used to monitor the progress of flights (qualitative forecasting), follow the pest dynamics and to estimate the level of pest population (C. pomonella). Original Article International Journal of Biological Research and Development (IJBRD) ISSN(P): 2250-0022; ISSN(E): Applied Vol. 6, Issue 2, Apr 2016, 1-8 © TJPRC Pvt. Ltd.