Beginner Gardening: What is eating my poor vegetables?, 3 by kg2943

kg2943 wrote:
My tomatoes and peppers are still growing, and most of my marigolds. But the marigolds leaves look awful, they are purplish and the plant withers. The withering, and some of the white spots are very similar to the white spots on the tomatoes and peppers, and also my citronella plant. In addition to the white spots, it seems to spread and worsen on those particular leaves, and they eventually die. The condition does not affect all the leaves, and there is still new growth. There are also holes, as if they are being chewed, but not on every leaf with the spots and on healthy leaves. I tend to think these are unrelated problems, then. I planted the marigolds with the tomatoes because I read they can deter pests. Please help.