My zucchinis have developed brown spots inside. What could cause this problem, as I have not had it before? Can see no sign on outside of vegetable. I am growing organically.
This could be a sign of pests or the onset of a fungal issue. Treat the plant with neem oil. This is a safe organic insecticide and effective for use with many insect pests, though will not hurt beneficial insects, pets or humans. It is also a fungicide. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm