Botryobasidiaceae

The primary symptom is the presence of a white or grayish, spiderweb-like mycelial mat on the stems near the soil surface.

Tissue underneath the fungal growth often becomes water-soaked, soft, and necrotic, leading to the collapse of stems.

Foliage may show signs of chlorosis, wilting, and eventual necrosis due to the disruption of water and nutrient transport in the plant.

In seedlings, the infection often leads to rapid damping-off, where the base of the plant shrivels and the seedling dies within days.

• Web-like white mycelial growth on stems.
• Water-soaked, soft lesions at the base of the stem.
• Yellowing and wilting of leaves.
• Seedling death and damping-off symptoms.

Botryobasidiaceae is a family of fungi in the order Cantharellales, which includes several species acting as significant plant pathogens and soil-borne fungi.

The fungi within this group are characterized by their mycelial growth patterns, which often form thin, web-like structures on the surface of host tissues.

Many members of this family are associated with anamorphic stages that resemble Rhizoctonia, causing damping-off and stem rot in various plants.

They survive in soil debris or as saprotrophs, becoming parasitic when environmental conditions favor the rapid colonization of weakened plant parts.

The pathogen utilizes enzymes to break down plant cell walls, allowing it to penetrate and expand through the stems of susceptible crops.

High humidity levels and poor ventilation in the canopy or greenhouse are the most critical factors driving the spread of the disease.

Cool to moderate temperatures, typically between 15 and 25 degrees Celsius, provide the ideal metabolic environment for fungal colonization.

Excessive irrigation and the lack of proper soil drainage encourage the proliferation of the pathogen from the soil to the plant tissue.

Overcrowded planting layouts inhibit air circulation, causing prolonged leaf wetness that is highly conducive to infection.

Repeated cropping of the same plant species in infested soil leads to a significant increase in pathogen population density over time.

The economic impact of Botryobasidiaceae includes severe yield loss due to plant mortality and the decline of overall crop vigor.

Marketability of produce is significantly reduced, as infected plant parts suffer from rotting and discoloration, making them unfit for sale.

In greenhouses, the disease can rapidly become an epidemic, potentially destroying entire production batches if left untreated.

The cost of remedial actions, including soil sterilization and fungicide applications, imposes a heavy financial burden on growers.

Chronic infections lead to stunted growth, reduced photosynthetic area, and overall failure to reach maturity in affected plants.

Implementing a strict crop rotation program is essential to disrupt the life cycle of the soil-borne fungal population.

Improving soil aeration and ensuring proper drainage can drastically reduce the humidity levels at the soil surface.

Sanitation practices, such as removing and destroying infested plant material, are crucial to prevent the spread of the pathogen to clean areas.

Chemical control using systemic fungicides can be effective, provided they are applied during the early onset of symptoms.

Utilizing drip irrigation instead of overhead watering helps keep the stems and foliage dry, minimizing the risk of infection.