Abstract
In this study, we have isolated and identified 5 bacterial isolates from European shot-hole borer,Xyleborus dispar (Coleoptera: Scolytidae), an important pest of hazelnut. After various morphological, physiological, biochemical and molecular characteristics were determined in detail, bacterial isolates were identified asPseudomonas fluorescens (Xd1),Bacillus megaterium (Xd2),Bacillus thuringiensis (Xd3),Pseudomonas rhizosphaerae (Xd4) andPantoea cedenensis (Xd5). Especially, theB. thuringiensis strain was identified in more detail asBacillus thuringiensis subsp.tenebrionis (H8ab). The insecticidal activities were determined against the larvae ofAgelastica alni L. (Col.: Chrysomelidae),Amphimallon solstitiale L. (Col.: Scarabaeidae),Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae), andMelolontha melolontha L. (Col.: Scarabaeidae) larvae at 1.8×109 CFU/ml dose, within five days. The highest insecticidal activities are 100, 100, 80 and 100% forBacillus thuringiensis subsp.tenebrionis (Xd3) onA. alni, A. solstitiale, L. decemlineata, andM. melolontha larvae, respectively. Our results indicate that especiallyB. thuringiensis subsp.tenebrionis (Xd3) may be valuable as a microbial control agent for coleopteran pests, respectively.
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