Powdery Mildew

Powdery mildew is a fungal disease caused by various Erysiphaceae species that affects cannabis plants, characterized by white, powder-like coating on leaves, stems, and buds. The condition thrives in warm, humid environments with poor air circulation and is commonly observed in indoor and outdoor cultivation settings. Breeders and cultivators track powdery mildew susceptibility as a critical trait because infection can reduce yield quality and necessitate intervention. Genetic resistance to powdery mildew varies significantly across cannabis lineages, making disease tolerance an important breeding target. Understanding mildew pressure in regional growing conditions helps inform strain selection and cultivation practices.

Breeders working in disease-resistant cultivar development prioritize powdery mildew tolerance, often crossing landraces and modern hybrids known for stronger resistance traits. Documenting mildew performance across generations helps establish reliable parent lines for stable, resilient genetics.