I have researched and feel that I have a problem with fusarium. Can that also affect cucumbers and zucchini? Their leaves are also yellowing from the bottom and dry up. If so, that pretty much is my whole garden area. Is there not something to spray or spread on them so I can save this year's crops?
Problem With Fusarium
Fusarium is not usually listed as found on cucumbers and zucchini, but not to worry, there are plenty of diseases that affect them. Vigilance and sanitation are your first line of defense. Here are a few articles that might be of interest to you: https://www.gardeningknowhow.com/plant-problems/disease/controlling-fusarium-wilt.htm