Variation in External Symptom Development of Pine Wilt Disease in Field Grown <i>Pinus thunbergii</i>

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  • クロマツ林におけるマツ材線虫病罹病木の外部病徴の変異
  • クロマツ林におけるマツ材線虫病罹病木の外部病徴の変異〔英文〕
  • クロマツバヤシ ニ オケル マツザイ センチュウビョウ リビョウボク ノ ガイ

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Abstract

To determine the temporal relationship between the tree decline and the death process of trees naturally infected with Bursaphelenchus xylophilus (STEINER et BLIFIRER) NICKLE, the degrees of oleoresin exudation from artificial wounds were determined on all trees in a Pinus thunbergii PARL. stand each month from May to October, and the foliage coloration was observed each week from June through October and one to three times each month from November to May. Of the trees first weakened from June through September, a large proportion of them died, and all of their foliage had become red-brown or brown in the year when they were first weakened (Pattern A). The time required for them to die was longer in trees first weakened in June or July than in trees first weakened in August or September. In some trees first weakened in September or October, nearly all of their foliage became discolored during the year in which they were first weakened, and all of their foliage became red-brown or brown during the following year (Pattern B). In some trees first weakening between August and October, a part of their foliage became discolored during the year when they first weakened; nearly all of their foliage became discolored during the next year, and soon after that all of their foliage became red-brown or brown (Pattern C). In a few trees first weakened in October, a part of their foliage became discolored the following April, and all of their foliage became red-brown or brown by mid-June at the latest (Pattern D).

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