Walnut: Anthracnose (Blotch) Categories: Tree Fruits Walnut Walnut Diseases Last review date: 2026-08-28 02:29 Last edit date: Walnut anthracnose infection on leaf Photo by: R.S. Byther Biology Anthracnose or blotch of walnut is caused by a fungus. The disease affects leaves, young twigs, and nuts. Leaves develop irregularly circular reddish-brown to grayish-brown spots up to […]
Walnut: Blackline Categories: Tree Fruits Walnut Walnut Diseases Last review date: 2025-08-23 12:21 Last edit date: Walnut with bark cracks and blackline at graft union Photo by: J. W. Pscheidt Biology Blackline is a viral disease of English walnut (Juglans regia). It causes death of water-conducting tissues at the graft union. Initially, infected trees show […]
Walnut: Blight Categories: Tree Fruits Walnut Walnut Diseases Last review date: 2026-08-28 02:29 Last edit date: Walnut blight symptoms on husks Photo by: R.S. Byther Biology Walnut blight is a bacterial disease affecting leaves, nuts, and other new growth including flowers. Bacteria are spread to new growth in the spring by rainy weather during the […]
Walnut: Thousand cankers disease Categories: Tree Fruits Walnut Walnut Diseases Last review date: 2025-08-23 12:29 Last edit date: Biology Thousand cankers disease (TCD) of walnut is a fungal disease associated with and spread by walnut twig beetles (WTB). Beetles feed on both healthy and damaged trees but injured or weakened trees are more susceptible to […]