Emerald ash borer is an invasive beetle that attacks ash trees in Colorado by tunneling beneath the bark and disrupting the tree’s ability to transport water and nutrients, which can quickly lead to decline and death if left untreated.

The mountain pine beetle attacks trees in Colorado by boring through the bark of pine trees and introducing blue-stain fungus, which blocks the tree’s water and nutrient flow and often results in widespread tree mortality.

The Ips engraver beetle damages trees in Colorado by boring into the inner bark of stressed or weakened pines, cutting off the flow of water and nutrients and often leading to rapid tree decline or death.

Fire blight is a highly contagious bacterial disease in Colorado that affects apple, pear, and other ornamental trees, causing blackened, wilted shoots and branches that can spread quickly and lead to severe dieback or tree loss if not properly managed.

Tree canker is a disease common in Colorado that causes localized dead areas on branches or trunks, restricting the flow of water and nutrients and weakening trees, which can lead to dieback, structural failure, or eventual tree death.

Chlorosis is a condition common in Colorado trees, often caused by nutrient deficiencies or high-alkaline soils, that leads to yellowing leaves, reduced photosynthesis, stunted growth, and overall decline in tree health.

Anthracnose is a fungal disease that affects many trees in Colorado, causing leaf spots, blotches, and premature leaf drop that can weaken trees and reduce their overall vigor, especially during cool, wet spring conditions.