The crop pathogen Fusarium graminearum often colonizes non-cultivated grasses, but the phenotypic variation found in isolates recovered from these hosts has not been thoroughly investigated or compared to that observed in isolates collected from crop hosts. Fusarium graminearum growth, perithecia formation, and virulence on crops (maize seedlings, wheat seedlings, wheat spikes) were measured in laboratory and greenhouse experiments using isolates (n = 24) recovered from three non-cultivated grasses (Bromus inermis, Dactylis glomerata, and Phalaris arundinacea) and winter wheat (Triticum aestivum) found at a single research farm in northeastern New York. While individual isolates varied significantly for all phenotypes measured, grass and wheat derived isolates displayed a comparable range of phenotypic values. Trichothecene genotypes were determined from the TRI12 and TRI1 loci, and mycotoxin production was quantified in mature wheat spikes. Trichothecene genotype and phenotype were largely concordant and were not related to isolate source. These findings support consideration of non-cultivated hosts as sources of diverse pathogen inoculum that may cause crop disease.

作物病原体禾谷镰刀菌经常定居在未耕种的草丛中，但尚未对从这些寄主中回收的分离株中发现的表型变异进行彻底调查或与在农作物寄主中分离出的菌株进行比较。禾谷镰刀菌生长，子囊壳的形成，和毒力对作物（玉米苗，小麦苗，小麦尖峰）在实验室和温室试验测定使用分离株（n = 24）从三个非栽培草回收（无芒雀麦，鸭茅，和ala（winter）和冬小麦（Triticum aestivum））在纽约东北部的一个研究农场发现。尽管各个分离株的所有表型差异很大，但从草和小麦衍生的分离株表现出可比的表型值范围。从TRI12和TRI1位点确定了单端孢菌素基因型，并定量了成熟小麦穗中的霉菌毒素产量。天花粉体的基因型和表型在很大程度上是一致的，与分离源无关。这些发现支持将非栽培宿主视为可能导致农作物疾病的多种病原体接种物的来源。