Houseflies do not have as many. Tachinids also move around in a fast, jerky unhousefly-like manner. Keep garbage cans closed tightly, do not put meat in the compost pile, and bury anything attractive to flies deep in the compost pile. Clean up pet and animal waste. Ladybugs are generally slimmer, and they move about faster than the plump, round Mexican bean beetles.
Beans can tolerate a great deal of leaf damage and still yield well.
Plant a new row or two of beans every few weeks throughout the season so that there's always a new crop coming in to replace any that gets damaged. Protect crops with row covers, and remove spent plants as soon as possible because they may harbor bean beetles. The beneficial insects you can attract with these flowers include parasitic wasps, predatory wasps, hover flies, lacewings, tachinid flies, and ladybugs. If your garden is not frequently moistened by rain or morning dew, sprinkle a part of your garden briefly every day. A large pottery saucer with an inch or two of water will suffice.