The continuous accumulation and combination of small amounts of toxic substances can create problems. If misused, small quantities of toxic chemicals can cause environmental disruption. A pest population can become resistant to pesticides when only one or two products are used repeatedly against a specific pest. Synthetic chemical pesticides should be the last defense to control a pest after other forms of control have been exhausted. Spraying should not be set by the calendar.
Schedule treatments to be most effective and least disruptive to naturally existing pest predators.
Be sure to use proper safety equipment and procedures as directed on the label. Choose the Right Chemical Seek good advice when in doubt about a problem. Buy only what you need for one season. Some pest control products lose their effectiveness sitting on the shelf. Some will require specific storage conditions.