I live in Los Angeles and am growing cucumbers in a container. My cukes were going like gangbusters until about a week ago, had probably 10 little baby cukes growing, and then my leaves started turning yellow. The whole plant is light yellow now, with some leaves having turned brown and died. Most of the babies have died off too, though the larger ones have continued growing.
Its been pretty hot here and the plants are in full sun, so I was watering every other day. Investigated the leaves, don't see anything like bugs or mites. Tried a Epsom salt foliar spray but nothing seems to have helped. I also tried some more veggie fertilizer on Tuesday. I eased up on water on Tuesday, and actually haven't watered since then, to see if maybe I was over watering.
I can add some photos later today once I'm home.
Does anyone have any ideas? I have had similar issues with my container zucchini (leaves yellowing and dying), and my tomato plant has a few yellowing leaves at the base and has yet to fruit.