radiobotrya

Radiobotrya is a genus of fungi belonging to the family Dothideaceae. These fungi are known plant pathogens, commonly affecting a variety of host plants, including deciduous trees and shrubs. They are characterized by their production of pycnidia, which are small, flask-shaped fruiting bodies that contain conidia, the asexual spores of the fungus.

The most well-known species within this genus is Radiobotrya defolians, which causes leaf spot diseases. Symptoms typically include circular to irregular necrotic spots on the leaves, often with a distinct border. In severe infections, defoliation can occur, weakening the host plant and making it more susceptible to other stresses. The fungus overwinters on fallen leaves and infected twigs, with spores being dispersed by wind and rain in the spring to infect new growth.

Control measures for Radiobotrya infections often involve cultural practices such as sanitation, removing fallen leaves and pruning infected branches to reduce inoculum. Fungicidal treatments may also be employed, particularly in commercial orchards or high-value ornamental plantings, to protect against infection and disease progression. Identification of Radiobotrya species is typically based on morphological characteristics of the pycnidia and conidia, as well as host range and disease symptoms. Research continues to understand the life cycle and pathogenicity of these fungi to develop more effective management strategies.