Trap bags were used to assess the presence of an Armillaria species in a Pinus koraiensis plantation in Heilongjiang,China.216 trap bags containing bark were p1aced in three plots at 2×2m spacing.Afer 10 weeks,the presence of Armillaria was determined from the growth of rhizomorphs in the trap bags.The trap bag method proved successful in determining the presence of viable Armillaria rhizomorphs where only a few dead trees showed signs of the diseade.The distribution of positive traps corresponded generally with the presence of rhizomorphs in the soil taken from the trap holes.However,the trap bags were superior to soil samples for evaluating the presence of viable rhizomorphs.The fresh,abundant rhizomorphs were easily identified by persons inexperienced in the assessment of Armillaria root rot.Several practical problems need to solved before the method is applicable in general forest manage-ment in China.
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