OBJECTIVE FORESTRY

Detailed explanation-1: -Since it was first recognized in 2008, thousand cankers disease (TCD) has caused the widespread death of black walnut trees (Juglans nigra) throughout the western United States.

Detailed explanation-2: -Thousand cankers disease is a fungal disease of walnuts (Juglans spp.) that is carried from tree to tree by a small bark beetle called the walnut twig beetle (Pityophthorus juglandis). It has killed countless ornamental black walnut trees in the western U.S. and was found for the first time in the eastern U.S. in 2010.

Detailed explanation-3: -What is it? Thousand cankers disease primarily attacks black walnuts and is caused by the combined activity of the walnut twig beetle and a fungus it transmits. The fungus is spread as adult beetles feed beneath the bark.

Detailed explanation-4: -Thousand Cankers Disease of Black Walnut Cankers caused by the fungal pathogen Geosmithia morbida form wherever the walnut twig beetle (Pityophthorus juglandis) probes the wood. Eventually hundreds or thousands of cankers form, coalesce and cause tree mortality.

Detailed explanation-5: -black walnut, (Juglans nigra), also called eastern black walnut, tall tree of the walnut family (Juglandaceae), native to eastern North America and valued for its decorative wood.