Hoehnelomycetaceae

The Hoehnelomycetaceae family consists of basidiomycete fungi belonging to the Exobasidiomycetes class. These pathogens are known for their intricate life cycles and their tendency to cause localized morphological changes in host tissues, often leading to hypertrophy or hyperplasia in infected plant parts.

As obligate parasites, these fungi infect specific host plants, typically focusing on leaves, shoots, and reproductive structures. The disease type is characterized by systemic infection that disrupts plant hormone balance, leading to the formation of galls, leaf thickening, and abnormal shoot development commonly referred to as witches' brooms.

The host range is predominantly limited to various shrubs, ornamental plants, and some forest species. In commercial nurseries, infection can be devastating to the ornamental value of the crop, resulting in stunted growth and weakened plant immunity, which may lead to subsequent mortality if untreated.

Environmental conditions that favor the spread of these fungi include prolonged periods of high humidity, frequent rainfall, and moderate temperatures. The spores are typically dispersed by wind and rain splash, allowing them to infect emerging tissues early in the growing season when environmental humidity is at its peak.

Management strategies focus on sanitation and chemical intervention. Pruning and destroying infected branches is essential to prevent the spread of the pathogen. Fungicide programs, applied during the bud break period, are the most effective means of preventing the initial infection cycle from establishing itself in a clean crop.