I assume the answer is water/ moisture.
Step-by-step explanation:
The best way for farmers to prevent fungi from growing is to make sure there is not enough “moisture” for fungi to survive and grow.
The best way to prevent fungi from attacking your plants is to buy disease resistant varieties whenever possible. Other ways include minimizing the amount of water contacting foliage. Water at the soil level and early in the day. This allows foliage to dry out quickly, should it become wet. It’s also helpful to provide good air circulation through proper spacing between plants, and pruning.