Q.Does My Zucchini Plant Have Mosaic Virus?
I’m a first time gardener and noticed today this zucchini plant has different leaves from my others. Looking back at photos, it always has had different colors on the leaves, but it’s been the plant to grow the fastest so I didn’t think anything of it until I started searching for some answers for new spots that appeared on my cucumber plant. Thanks for your help!

Certified GKH Gardening Expert
I see signs of Calcium/Magnesium deficiencies, but It may be linked to overwatering, and raised soil pH from bacteria. Make sure that the water from those containers is allowed to leave completely. This means ensuring plenty of drain holes are present.
You may treat with a fungicide/bactericide to help with this. Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/special/organic/biofungicide-information.htm
https://www.gardeningknowhow.com/garden-how-to/info/homemade-fungicide.htm
https://www.gardeningknowhow.com/garden-how-to/info/applying-bactericide-to-plants.htm
Dolomitic Lime and Wettable Sulfur can help, here, as well. They can help balance out soil pH, suplement calcium and magnesium, and help kill off infections.