Cotylidia pannosa

Visible symptoms often begin as small, pale, growth-like structures at the base of the stem or near the soil line.

Infected plant tissues show discoloration, turning dark brown as the fungus infiltrates the stem structure, causing localized necrosis.

Plants affected by the fungus exhibit signs of wilting and stunted growth due to the interruption of the plant's vascular system.

A white or cream-colored fungal mat may appear around the infected stem base, signifying advanced stages of colonization.

Mechanical weakness of the lower stem is a common outcome, leading to lodging of the crop when exposed to wind or rain.

The causal agent of this disease is the basidiomycete fungus Cotylidia pannosa, a member of the Hymenochetoid fungi group.

Typically, this pathogen acts as a saprotroph, decomposing dead organic matter, but it can turn into a parasite on stressed host plants.

The fungus produces distinctive funnel-shaped or folded fruiting bodies which are essential for its identification during field scouting.

Mycelial growth occurs primarily in moist environments where organic debris provides a steady source of nutrients for the fungus.

Dispersal is primarily achieved through airborne spores that land on vulnerable plant tissues when environmental conditions are optimal.

The development of Cotylidia pannosa is heavily dependent on moisture levels in the soil and near the plant base.

High humidity and poor air circulation within the plant canopy provide the perfect microclimate for the pathogen to thrive.

Shaded areas or fields with excessive plant density are more susceptible to infection due to reduced evaporation rates.

Persistent moisture on the soil surface allows the fungus to initiate its reproductive cycle and form new fruiting bodies.

Temperatures ranging from cool to moderate are generally conducive to the metabolic activity and spread of the fungus.

The primary damage results from the disruption of water and nutrient transport, leading to physiological stress in the crop.

Growth reduction significantly decreases total yield and impacts the commercial quality of the harvested produce.

Lodging caused by stem weakness results in increased harvest losses and operational difficulties for machinery.

The disease can lead to localized plant mortality, which creates gaps in the field and reduces overall stand density.

Infected plants become significantly more susceptible to secondary pathogens and opportunistic pests that exploit weakened tissues.

Prevention begins with good cultural practices, such as ensuring proper plant spacing to improve airflow within the canopy.

Rigorous sanitation, including the removal of dead crop residues and organic debris, is crucial to limit the infection reservoir.

Effective water management that avoids waterlogging in the root zone is a key deterrent for fungal development.

Application of systemic or contact fungicides during periods of high humidity can help control the spread of the pathogen.

• Proper crop rotation to reduce disease pressure.
• Removing infected plant materials immediately.
• Improving drainage to manage soil moisture levels.
• Monitoring canopy health during wet seasons.