Astable integrated pest management program incorporates a balance of chemical and biological control (also known as biocontrol) components. For many years, IPM programs in western orchard systems were fairly stable, thanks to broad-spectrum pesticides that controlled key pests and natural enemies that became resistant to them. Then, legislatively mandated changes in pesticide use resulted in the unintentional disruption of natural enemies. Growers were faced with having to spray more to control outbreaks of secondary pests.
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