Promotion of the population growth of pinewood nematode in 4-month-old Japanese black pine seedlings by pretreatment with simulated acid rain |
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| Authors: | Ei-ichiro Asai Kazuyoshi Futai |
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| Institution: | (1) Laboratory of Environmental Mycoscience, Graduate School of Agriculture, Kyoto University, Sakyo-ku, 606-8502 Kyoto, Japan |
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| Abstract: | Simulated acid rain (SAR) at three pH levels (pH 4, 3, 2) was applied to only the top or both the top and roots of 4-month-old
Japanese black pine seedlings repeatedly for two months. Then the seedlings were inoculated with a virulent isolate (S10)
of pinewood nematode,Bursaphelenchus xylophilus. The exposure to SAR at any level did not kill the seedlings. When inoculated with nematodes, however, the nematode population
build-up was significantly higher in the seedlings pretreated with SAR at any level than in the control at the 7th and 17th
day after inoculation, and subsequent disease symptom development was also significantly accelerated by the exposure to SAR
at pH 2 and 3. This result indicates that even acid rain at pH 4 has the potential for promoting population growth of pinewood
nematodes in 4-month-old Japanese black pine seedlings. |
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| Keywords: | Bursaphelenchus xylophilus current-year old seedling pine wilt disease Pinus thunbergii simulated acid rain |
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