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Plucking a thorn from a nearby Japanese barberry bush, he scraped the yellow dust off, revealing three painted dots underneath.

Species in the ban also include the Japanese barberry and Wintercreeper.

Problem trees and shrubs include ailanthus, callery or Bradford pear, autumn olive, bush honeysuckles, winged burning bush and Japanese barberry.

Resh says one of those undesirables is the Japanese barberry, which becomes ground cover in many forests.

State officials say that the Maine landscape is being invaded by otherwise lovely plants like “Crimson King” Norway maple, burning bush and Japanese barberry.