Transmission of Bursaphelenchus xylophilus through Oviposition Wounds of Monochamm carolinensis (Coleoptera: Cerambycidae)
Abstract
Transmission of pinewood nematode through Monochamus carolinensis oviposition wounds was documented. Nematode transmission was measured as the average number of nematodes isolated per oviposition wound excavated and also as the percentage of oviposition wounds from which nematodes were isolated. The influence of three factors that might affect nematode transmission was investigated: age of the beetle vector, number of nematodes carried per beetle, and egg deposition in the oviposition wound. Only the number of nematodes carried by the beetle was found to have a significant effect on transmission. Nematodes were transmitted more frequently and in slightly greater numbers by beetles carrying more nematodes. The influence of pinewood on nematode exit from beetles were investigated by comparing nematode exit from beetles placed over pine chips with those placed over distilled water. Nematodes exited in greater numbers and at a higher frequency from beetles over pine chips than from beetles over distilled water. Apparently, the nematodes are able to detect a factor from the pine chips that promotes their exit from the beetles. Key words: Bursaphelenchus xylophilus, Monochamus carolinensis, nematode, pine sawyer, pinewood nematode.Downloads
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