Find a book on worm composting in your library or search for information about it on the Internet. Set up a composting box using worms. Proper washing reduces exposure to pesticides. Cut up a carrot and dip the pieces in a mixture of red pepper and oil. Test taste after each attempt to see which works the best.
Bats eat agricultural pests as well as mosquitoes.
Build and put up bat houses. Order ladybugs through a garden supply store and release them into part of a crop at school or in a private garden. Use netting to keep them in the target area. Compare total weight of produce grown with and without the ladybugs. This Newton's Apple segment on Children's Health and the Environment is made possible by a grant from the U.S. Environmental Protection Agency.