What do I do about diseased plants or bugs?

Please don't use an inorganic pesticide or fungicide. Trim the bad parts off, or if the entire plant is in poor shape, compost the whole thing. Squash seeds can be replanted, as can tomato plants. I would rather start over than allow us to put those chemicals into the ground and our body. With proper nutrition (fertilizer), and watering, the plants should be fine.

Seeing lots of bugs? Mix some dish soap (in the shed) with a watering bucket and rinse. Another method is the squash method. (step on it)

There are also "orange oil" rinses that can be purchased at any local nursery or HEB.