The hazelnut leaf holer (Anoplus roboris Sufr., Coleoptera: Curculionidae) is a devastating pest of
hazelnut and oak trees. It causes approximately 20-30% economic damage to hazelnut production per
year in Turkey. In the present study, in order to fin...
The hazelnut leaf holer (Anoplus roboris Sufr., Coleoptera: Curculionidae) is a devastating pest of
hazelnut and oak trees. It causes approximately 20-30% economic damage to hazelnut production per
year in Turkey. In the present study, in order to find a more effective and safe biological control agent
against A. roboris, we investigated the bacterial flora of the hazelnut leave holer, and tested them for
insecticidal effects on it. According to morphological, physiological and biochemical tests, bacterial
flora were identified as Bacillus circulans (Ar1), Bacillus polymyxa (Ar2), Enterobacter sp. (Ar3) and
Bacillus sphaericus (Ar4). Insecticidal effects of bacterial isolates were performed on adult A. roboris.
The highest insecticidal effect determined was 67% by B. sphaericus within eight days. The insecticidal
effects of the other isolates (Ar1, Ar2 and Ar3) were determined as 33%, 47% and 47% within the
same period, respectively