Observations on the overwintering forms of Scolytus amygdali (Coleoptera: Curculionidae) in Tunisia

Abstract : 

The almond bark beetle, Scolytus amygdali is an economically important insect pest of many cultivated species of stone fruit trees grown in the Mediterranean region. During the winter in the center region of Tunisia, the activity of this beetle pest decreases and it overwinters in larval forms. The mean number of entrance holes during the winter was 31 (� 27.155).The attack number gradually decreased from October to December and it was significantly different during the sampling dates. The attack number and the date of sampling are negatively related. Same observation was noticed for the number of oviposition. Haut du formulaire The composition of the overwintering population of S. amygdali showed that the most available forms were; young larvae followed by old larval stages and pupal stagesHaut du formulaire. Larvae of S. amygdali entered into overwintering behavior from late November. The life cycle of S. amygdali restarts when temperature goes warmer (late February)


Keyword : 

Overwintering population, Scolytus amygdali, Tunisia


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