Doassansiopsidaceae

Doassansiopsidaceae is a family of basidiomycete fungi belonging to the order Doassansiales, which act as specialized parasites of aquatic and semi-aquatic plants. These fungi cause specific diseases resembling smuts, primarily affecting tissues of higher aquatic plants such as Potamogeton, Alisma, and Butomus.

The causative agent of the disease consists of microscopic fungi that form sori within the tissues of the host plant. Unlike typical smut fungi, members of this family develop within the parenchyma, forming so-called spore balls or sporeclasts that replace the healthy tissues of leaves or stems.

Symptoms of infection manifest as chlorotic spots, galls, or localized deformations of the leaf blades. In the areas where spores develop, plant tissue often takes on a yellowish or brownish hue, and severe infection frequently leads to premature necrosis of the aerial parts of the shoots.

The development and spread of the pathogen are directly dependent on the water regime. High humidity, stagnant water, and optimal temperatures facilitate the active germination of teliospores and their dispersal throughout the water body via currents or plant debris. The fungus persists in the soil of bottom sediments and on plant detritus.

The damage caused by this pathogen is expressed in the weakening of ornamental and fodder aquatic crops. Control measures include:

• Removal and destruction of infected plant residues.
• Monitoring the health and purity of planting material in aquatic cultivation.
• Implementing crop rotation or water exchange regimes in artificial reservoirs.
• Targeted use of fungicides only in zones approved for aquaculture.