The pine wood neiTi.itode, Bursaphelenchus xylophilus was found on baLsani iir in Minnesota and Wisconsin but was .ipparently not the primary cause of tree mortality. Unlike li. xylophilus from pine, adult females from hals.im fir had mucronate tails similar to those of /i, mueronatus.However, B. xylophilus from balsam fir mated with B. xylophilus from pine and not with B. mueronatus. The balsam fir isolate of B. xylophilus was pathogenic on (greenhouse grown balsam fir sccdlinj^s and did not kill Scots or red pine seedlings. The converse was true for a pine isolate of B. xylophilus Irom Minnesota which killed pine and not balsam fir seedlings. Pine and balsam fir isolates of B. xylophilus reproduced equally well on cultures of Botrytis einera, but the balsam fir isolate reproduced minimally on cultures of Ceratocystis ips.
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