Aspen trees can be a supermarket for insects and diseases. Some of the challenges are listed here with references to more detailed control. Ailments affecting leaves Aphids are small insects that ...

The city of Aspen announced Tuesday an increase in early leaf drop of some cottonwood trees due to a surge in fungal diseases. The primary fungus causing damage is Septoria, which is a common foliar ...

There is a disease of certain garden trees, particularly Swedish columnar aspens and tower poplars ... and was suspected to be in Calgary’s aspen population since about 2007.

Bronze leaf disease, relatively new to the city, can kill trembling aspen, Swedish columnar aspen and tower poplar, according to the city. Tower poplars and aspens are favourite trees among ...