WL Nutrient Agar (Wallerstein Laboratory Nutrient Agar) is a selective solid medium designed for the isolation and enumeration of yeasts and molds in food, beverages, dairy products, and environmental samples. It promotes the growth of fungi while inhibiting the growth of most bacteria, making it suitable for detecting fungal contamination. The medium includes indicators like bromocresol green to differentiate acid-producing yeasts. Commonly used in quality control for brewing, food processing, and pharmaceutical industries to perform total yeast and mold counts (TYMC). Its specialized formulation ensures reliable detection of non-fastidious yeasts and molds in routine microbiological testing.