Why are my cucumber seedling leaves turning white?
White leaves on cucumber seedlings can be caused by a few factors, including powdery mildew, nutrient deficiencies, or sunburn. Powdery mildew is a common fungal disease that appears as a white powdery substance on the leaves. Nutrient deficiencies, particularly in nitrogen, can also cause leaves to turn white. Additionally, excessive sunlight or heat can lead to sunburn, resulting in white patches on the leaves. Proper care, such as providing adequate nutrients, spacing plants for good air circulation, and providing shade during hot periods, can help prevent and treat white leaves on cucumber seedlings.