The influence of temperature on reproduction and movement was examined for seven geographic isolates of Bursaphelenchus xylophilus, three of B. mucronatus, and two of their interspecific hybrids. All nematode isolates tended to be more active and fecund the higher the temperature, with the isolates of B. xylophilus reaching a reproductive peak at higher temperatures than isolates of B. mucronatus. Most isolates of B. xylophilus and B. mucronatus did not produce significantly more progeny at higher male-to-female ratios. The interspecific hybrids appear to possess temperature-related characteristics of either B. xylophilus or both of the parents.
Keywords: B. xylophilus; Bursaphelenchus mucronatus; behavior; fecundity; interspecific hybrids; nematode; sex ratio.