Biology of Tortrix viridana (Lep., Tortricidae) in cork oak forests of North-West Tunisia


Abstract: The green oak moth, Tortrix viridana L., is a common defoliator of cork oak and otheroak species that is considered as a competitor of the gypsy moth, Lymantria dispar L., in NorthAfrican oak forests; its damage however usually remain casual. Significant defoliations caused bythis insect have been observed from the late 90s in different cork oak forests of north-west ofTunisia. This study is the first performed on this pest in Tunisia; it aims at acquiring data on itsbio-ecology in two cork oak stands of the El Jouza and Bellif forests, which were infested in 2006and 2007. The results concerned its rates of infestation, the spatial distribution of the eggs and theimportance of the different mortality factors. The characteristics of the developmental instars ofthe leaf roller are also described.

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