Sophie, I absolutely love that acid green!

The nuts of walnut trees have two halves that have a bumpy texture with a papery covering.

Sep 15, Brown or black spots with yellowing are signs of anthracnose. This time of year, many black walnut trees’ leaves may have black spots, turn yellow and begin to drop.

This is commonly known as anthracnose, a fungal disease that causes trees to drop their leaves prematurely. Anthracnose is worsened by wet weather, and some trees are more genetically susceptible to anthracnose than bushnotch.barted Reading Time: 2 mins. Aug 13, Leaves appear later than many other trees in the spring. In the late summer or early fall, yellowed leaves begin raining down before most of the other trees begin dropping leaves.

One of the most notable contributors to the early leaf loss is a fungal disease called walnut anthracnose. Walnut anthracnose only affects walnuts and butternuts which belong to the same genus of Juglans. There Estimated Reading Time: 4 mins. If your walnut tree is a Black Walnut, Juglans nigra, there is a very serious disease of this species that is moving through the mountain states at this time. The disease is called Canker and is spread by the walnut twig beetle, which introduces fungal pathogens to the trees.

Aug 24, This is the time of year for Walnut owners to wear a bushnotch.bar behavior for this tree clusters like said some small branches will break off.

Tea they just found canker in PA. Talker to a forester in Corning,NY 15 min to PA border seemed a little worried as we looked down a road that had Walnuts though out the bushnotch.barted Reading Time: 2 mins. 13 years ago. I see this pretty frequently - and it may be due to a number of factors - and sometimes a combination of one or more of them. Drought stress. Poor pollenation, with these early drops being 'aborted' nuts.

Insect pests - walnut husk maggot, in particular. Fungal disease - especially walnut anthracnose.