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1977年,一种异常的花旗松(Pseudotsugamenzlesii Var.)枝枯病在堪萨斯州的Rilty及johuson发生。在johuson一个苗圃里,这种病害产生的症状同由Phomopsis Lokoyae或冻害引起的症状相似。然而,病枝的大量分离,一致产生Botryshaeria dothidea (Moug. exFr.)Ces. & de not无性阶段(Botryospheariaribis Gross & Dogg)。这种真菌引起多种树木的干部和枝条溃疡病。同样,也会使亚利桑柏树引起一种严重枝枯病。史密斯用这种菌在50种植物的干部接种,证明这是伤口侵染病原菌。而Luttrell 及Milholland 报道,B.dothidea同样能侵入无伤的榆树及乌饭树干。
In 1977, an unusual disease of Pseudotsugamenzlesii Var. Occurred in Rilty and johuson, Kansas. In a johuson nursery, the disease produces symptoms similar to those caused by Phomopsis Lokoyae or frostbite. However, the mass segregation of diseased branches consistently produces the Botryosphaariaribis Gross & Dogg (Botryshaeria dothidea (Moug. ExFr.) Ces. & De not). This fungus causes caducity and branch ulcer disease in many trees. Likewise, it can also cause a serious branch blight on the tree. Smith used this bacterium to inoculate 50 kinds of plant cadres, proving that this is the pathogen of wound infection. However, Luttrell and Milholland reported that B.dothidea could also invade the harmless elm and tussock branches.