The powdery mildew of wheat is associated with fungi

✅ Explanation: Powdery mildew of wheat is specifically caused by the fungal pathogen Erysiphe graminis f. sp. tritici. This fungus produces a white, powdery growth on the leaves, stems, and heads of wheat plants, leading to reduced photosynthesis and yield losses.

📌 Other Options Explanations:
-(b) E. graminis sp. hordei: This is the powdery mildew pathogen specific to barley.
-(c) Erysiphe polygoni: This fungus causes powdery mildew on a wide range of plants, including peas.