Companion planting and diversified planting utilize volatile plant chemicals which affect insect behavior. Companion planting is a cultural practice that uses plants with some insect repellent interspersed with other plants. The theory behind this practice is that the repellent action of the companion plants will impart some degree of protection to other plants. Most plants considered as companion plants are herbs or other plants that have volatile odors (e.g., marigold). Diversified planting takes advantage of the feeding preferences of insects, which locate food sources by shape, color and odor of the plants. Thus, mixing the plants helps decrease the attraction and the damage to the crops (Reeves 2001).