Endophytic fungi in the invasive weed Impatiens glandulifera: a barrier to classical biological control?

Summary The rust fungus, Puccinia komarovii var. glanduliferae , has been introduced into the UK for biological control of the invasive weed, Impatiens glandulifera (Himalayan balsam). However, establishment of the pathogen has differed across the country, which may be partly explained by variation in plant genotype. The aim of this study was to examine whether there is a further layer of phenotypic resistance, provided by indigenous foliar...