Ascotricha xylina

Ascotricha xylina is a fungal pathogen belonging to the group of molds that typically affect plant debris, fiber crops, and stored agricultural products. In agricultural practice, it is recognized for its ability to colonize cellulose-rich materials and weaken plant tissues, acting primarily as a necrotrophic or saprophytic organism depending on environmental conditions.

This fungus is most commonly associated with fiber crops, particularly cotton, where it can cause significant degradation of fiber quality. Additionally, it affects seeds and various plant substrates during storage if moisture levels are poorly managed. It thrives by breaking down organic components, which leads to the structural decay of the affected plant material.

Symptoms of an infection include the appearance of dark, velvety, or fluffy mycelial growth on the surface of the plant organs. As the fungus matures, it produces distinct spore-bearing structures that give the infection a black or dark grey appearance. Infected cotton bolls or seeds may show signs of tissue discoloration, becoming brittle and losing their commercial value.

Environmental conditions play a crucial role in the development and spread of Ascotricha xylina. High relative humidity and warm temperatures are the primary triggers for rapid spore germination and mycelial growth. In the field, prolonged rainy weather during the maturation phase creates the perfect conditions for the pathogen to establish itself on weakened or damaged crops.

The economic impact is primarily linked to the reduction in the quality of raw fibers and a decrease in seed germination rates. To protect crops and stored yields, it is essential to implement strict moisture control in storage facilities, ensure good ventilation, and use certified fungicides for seed treatment before sowing. Regular monitoring of fields during high-humidity seasons is also advised to prevent outbreaks.