At the U.S. National Arboretum we manage our pests with a
program called Integrated Pest Management (IPM).  IPM means
using a combination of methods to control and prevent pests. 
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The best way to manage pests is to use a combination of chemical and non-chemical control. Only take action when the problem is serious enough to damage the plant. If we all use Integrated Pest Management (IPM), we can control pests in an environmentally conscious manner.