ENVIRONMENT -- Anglers wading in rock snot or hikers walking through fields of spotted knapweed should be easy converts to the U.S. Department of Agriculture's new campaign to raising awareness of invasive species.

Native plant and wildlife species suffer the most from invasions of exotics.

If everyone chips in, the costly battle against a long list of invasives could be more effective.

USDA's Animal and Plant Health Inspection Service has summarized the campaign in "Seven Simple Steps” to leave invasive pests – non-native insects, other animals, plants and diseases that feed on America’s crops, trees and plants – behind.

The national “watch list” has been expanded to include 15 of the most damaging “Hungry Pests” that can cause havoc with our native flora and fauna.