Whiteflies

Did a search on the web and found out what the white bugs are that are on my zucchini plants. They are whiteflies. I wasn't surprised that marigolds are a natural way to get rid of these bugs. I remember I heard that planting marigolds are a natural way to control pests. I found on this website http://www.laters.com/plants/cucumber.htm that ladybugs like to eat them and that misting the plants with water will help. I think I already lost 3 of my zucchini plants to these whiteflies but I still have 5 other plants I'm hoping to keep alive. I'm all for natural ways of keeping pests away.