Suitability of Scolytus multistriatus and Dendroctonus ponderosae as hosts for the entomogenous nematode Neoaplectana carpocapsae
1981
MacVean, C.M. | Brewer, J.W.
The suitability of the lesser European elm bark beetle, Scolytus multistriatus (Marsham), and the mountain pine beetle, Dendroctonus ponderosae Hopkins, as hosts for the entomogenous nematode Neoaplectana carpocapsae Weiser was evaluated in laboratory and greenhouse experiments. These two species also were compared with larvae of the wax moth, Galleria mellonella (L.), with respect to suitability for nematode reproduction. All stages of both bark beetle species were susceptible to parasitism by N. carpocapsae, with rates of infection ranging from 10 to 66%. Adults of D. ponderosae were the least susceptible of all stages tested of both species. The rate of infection in D. ponderosae was dosage dependent up to 85 dauerlarvae (infective juvenile nematodes) per insect. A comparison of total yield of nematodes among the three insect species tested suggests that S. multistriatus and G. mellonella larvae are about equally suitable hosts for the nematodes; D. ponderosae appears considerably less suitable. Greenhouse trials showed that dauerlarvae of N. carpocapsae could be recovered alive from frass in beetle-infested pine bolts sprayed several weeks previously with a water-plus-antidesiccant suspension of infective nematodes.
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