A friend and I noticed plants getting a lot of white spots on plants and then leaves begin dying.
Spots on Zucchini Plant Leaves
Certified GKH Gardening Expert
If the white spots are powdery, then this is powdery mildew. This article will help:
If the white spots are small and concentrated in groups, it is likely mealybugs or a related pest. These articles will help with that: