Apple collar rot
very destructive organisms belonging to the Oomycetes and are therefore strictly speaking not fungi. They thrive at soil temperatures between 15 and 23 [...] are spores with flagellae, which enable them to move through water. Infection is usually from the root to the foot, but direct infection of the foot also [...] wetness is required. Dispersal by wind and rain causes the pathogen to be returned to the soil from infected plants. Dispersal in the soil happens via water