Spots on Zucchini Plant Leaves

Question

A friend and I noticed plants getting a lot of white spots on plants and then leaves begin dying.

Answer 1

If the white spots are powdery, then this is powdery mildew. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm

If the white spots are small and concentrated in groups, it is likely mealybugs or a related pest. These articles will help with that:
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm