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"For trees with particular emotional importance to their owners - he recommends preventative treatments such as trunk injections. Regardless of the type of tree or the threat, Brenteson says residents should regularly inspect their trees for changes. Dieback throughout the tree or rapid growth at the base can both be signs of major stress. He doesn't recommend using herbicides anywhere since these products kill both pests and valuable insects and fungus, and suggests avoiding weed cloth, which can prevent moisture from getting into the ground. At the end of the day, it all comes back to water.