Author： Melakeberhan H. Rutherford T.A. Webster J.M.
Publisher： Brill
ISSN： 1875-2926
Source： Nematologica, Vol.38, Iss.1-4, 1992-01, pp. : 80-87
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Abstract
In three separate experiments, one-year-old Pinus sylvestris seedlings were treated with either wound, wound + water, wound + Bursaphelenchus xylophilus culture filtrate, wound + 3,000 B. xylophilus, or unwounded controls and maintained at 15, 20 or 25°C for 340, 270 and 240 degree-days (DD-base 10°C) or 68, 27, and 16 days after inoculation, respectively. Bursaphelenchus xylophilus infected pines at all temperatures and nematode reproduction was similar and considerable at 20 and 25°C but low at 15°C. First pine death occurred at 215, 150 and 180 DD or 43, 15 and 12 days after inoculation at 15, 20 and 25°C, respectively. Visible symptoms and pine mortality at 20 and 25°C were correlated with the number of nematodes recovered from dead pines. At 15°C, nematode numbers were not correlated with visible symptoms. No control plants died in any of the experiments except that at 15°C which indicates that pine death at this temperature is not caused by nematodes alone. Furthermore, the data suggest that temperature increases B. xylophilus reproduction and possibly influences host physiology.
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