My garden was so great and producing just a couple of weeks ago. Now the only things still looking healthy are the peppers and tomatoes. My squash, zukes, cukes, watermelon, and pumpkins and marigolds are all dead or dying. There are bugs on them, but I don't know what it is and if I can save the plants from them. They lay red eggs and then when they hatch they look like spiders with yellow sacks. I'm pretty sure they aren't spiders, though. What should I do?