Sclerotinia rot

Sclerotinia rot, commonly referred to as white mold, is a severe fungal disease caused by the pathogen Sclerotinia sclerotiorum. It is recognized as one of the most destructive plant pathogens worldwide due to its ability to attack a vast range of broadleaf crops, including legumes, oilseeds, and vegetables.

The characteristic symptoms of the disease include the appearance of water-soaked lesions that rapidly expand and become covered with a dense, white, cottony mycelium. As the infection progresses, the fungal tissue hardens to form black, overwintering structures known as sclerotia, which are highly resistant to adverse environmental conditions.

The development and spread of the disease are highly dependent on environmental factors, particularly extended periods of high humidity and cool to moderate temperatures. These conditions stimulate the germination of sclerotia and the subsequent infection process, often leading to rapid outbreaks during the growing season.

The economic impact of Sclerotinia rot is significant, as it can cause widespread plant wilting, stem collapse, and decay of harvestable parts. Infected crops often suffer from reduced yields, and the presence of sclerotia in harvested grain or seeds can lead to downgrading and market losses.

• Implement crop rotation with non-host species.
• Ensure proper field drainage and plant spacing to reduce canopy humidity.
• Use certified disease-free seeds to prevent initial pathogen introduction.
• Apply fungicides as a preventive measure during critical growth stages.
• Destroy infested crop residues through deep plowing to bury sclerotia.

Effective management of Sclerotinia rot requires an integrated approach that focuses on reducing the initial inoculum in the soil and managing the microclimate within the crop canopy. By combining cultural practices with targeted fungicide applications, farmers can mitigate the risk of severe infections and protect their yield potential.