Investigations on comparison of host seeking behavior of hybrid entomopathogenic nematode Heterorhabditis bacteriophora strains with their parents
Yetişkin, İ.
Entomopathogenic nematodes (EPN) are soil-dwelling biocontrol agents which have lethal pathogenic effects on insects, and they are used for controlling pest populations. Broad host spectrum, host seeking ability, EPN-bacteria symbiotic relation and in vitro mass production capability of EPN lead them to be used efficiently in biological control. With some former studies, different Heterorhabditis bacteriophora (Rhabditida : Heterorhabditidae) strains isolated from different regions of Turkey were hybridized under laboratory conditions and ten hybrid strains were obtained. In the present study, host seeking behavior of three different superior hybrid strains and their parents were examined. Hb.17 (Kırklareli), Hb.5 (İzmir), Hb.1138 (Antalya) and Hb.4 (Şanlıurfa) were used as parent isolates and Hb.C, Hb.E and Hb.H were used as hybrid strains. All experiments were performed in Y-Olfactometer and host seeking behavior of the parent isolates and the hybrid strains were compared and Galleria mellonella (Lepidoptera : Pyralidae) larvaes were used as a host insect. Results and statistical analyses of the present study showed that Hb.C strain showed the best host seeking ability among other 7 strains and have better host seeking potential than its parents, Hb.17 and Hb.1138. However, Hb.H showed no difference between its parents, Hb.1138 and Hb.4. Furthermore, Hb.E showed worse performance than his female parent Hb.1138 and same performance with male parent Hb.
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