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Einfluss der Inokulumdichte von Bursaphelenchus xylophilus auf die Entwicklung der Kiefernwelke bei Pinus thunbergii unter dem Einfluss von Saurem Regen
Author(s) -
Asai E.,
Futai K.
Publication year - 2005
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/j.1439-0329.2004.00396.x
Subject(s) - bursaphelenchus xylophilus , biology , seedling , pinus thunbergii , inoculation , wilt disease , nematode , population , horticulture , botany , agronomy , ecology , demography , sociology
Summary Six‐month‐old Japanese black pine seedlings ( Pinus thunbergii ) were exposed to simulated acid rain (SAR) at pH 3 and 2 three times a week. After treatment for 2 months, the seedlings were inoculated with a virulent isolate (S10) of the pinewood nematode ( Bursaphelenchus xylophilus ), at three inoculum levels ( P i = 50, 160 or 500 nematodes per seedling). In seedlings inoculated with 500 nematodes, both population growth of nematodes and disease development were accelerated by pretreatment with SAR at pH 3 or 2. In seedlings inoculated with 50 nematodes, population growth of the nematodes was suppressed and more time was needed for seedlings to die when pretreated with pH 3 SAR. This suggests that exposure to pH 3 SAR increased not only the progress of mortality, but also simultaneously enhanced the tolerance limit of the seedlings to the pinewood nematode – the critical value of physiological burden (represented as a product of time and initial nematode population) necessary to kill a seedling. Exposure to pH 2 SAR accelerated nematode reproduction in seedlings and increased seedling mortality irrespective of the number of nematodes inoculated.