“The heat and humidity this summer have created perfect breeding grounds for fungi and disease, so to speak. So they’re in a state of equilibrium right now, trying to figure out how much time they need before they go dormant.”

This early color change poses a major environmental impact, but Morrison is confident the trees will simply regulate themselves. Given this summer’s difficult weather and the battle against pests and diseases, the trees may simply “cease operations” for this season and hope for better conditions next year.

Although she believes the trees should be fine, Morrison says they are missing out on a crucial opportunity to grow and develop.

Pests and diseases are a problem

Not only does changing weather alter growing conditions, it also brings with it pests and diseases. Many trees are battling threats such as the Asian ash borer, which severely impacts ash populations, and Dutch elm disease, which has been a significant problem for elms for many years.

Morrison also pointed out that last winter was shorter and milder than usual, which meant that many of the pests that attacked the trees were not killed. This extended the pests’ growth and breeding season, allowing them to attack the trees with more energy.

(Government of Ontario via CBC)