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How are insects and diseases controlled in wilderness?

Insects and diseases are a natural part of the ecosystem and are not controlled, unless epidemics are expected to cause unacceptable damage to adjacent lands and resources, or exotic species are expected to cause an unnatural loss to the wilderness resource. Noxious weeds and invasive non-native plant species may be eradicated by physical means, such as grubbing when the infestations are isolated, and herbicides may be used when absolutely necessary.