Pests and Diseases

Bacterial leaf scorch (BLS) is caused by the bacterium Xylella fastidiosa. This disease impacts certain shade trees resulting in uneven ‘scorching’ of leaf margins in late summer and early fall.

Two common causes of root disease in California are species of the fungus Armillaria and species of Phytophthora, which are fungus-like organisms. There are many differences between the two pathogens,

Leaf curl and leaf blister are a group of diseases caused by the fungus Taphrina. Taphrina caerulescens is the causal agent of oak leaf blister, and Taphrina deformans is the

The coast live oak is an important part of both the wild and urban landscape through most of coastal California. When these beloved trees are defoliated by our native oakworm

One of the most under-diagnosed causes of tree failure are root rot pathogens. Here in southern California we have a few rots that plague our trees and I want to

Winter Wash of Trees

If your trees or shrubs suffered badly from insect attack this year (e.g., aphid, scale, red spider mite, etc.), then there is an extremely high probability that they will be

Though strangely beautiful with their metallic green bodies and copper wings, Japanese beetles are a major pest in the eastern U.S. that feed on more than 300 different plant species.

Natural defense systems enable trees to ‘fight back’ when they’re under attack from pests or disease or facing stress from environmental conditions like drought. Even with these defense systems in

Most tree pests leave visible signs of their presence – if you know what to look for. Sometimes it’s easy to dismiss these observable symptoms. After all, it’s just a

“It is a capital mistake to before one has data” Sir Arthur Conan Doyle An unusual package has just arrived. Filled with plant material, the package is unboxed and the

In our urban landscapes, pest outbreaks occur more frequently than in natural habitats such as wooded forests. These pest outbreaks occur from urbanization processes such as buildings and roads that

Anthracnose

Anthracnose is one of the most common foliar diseases of landscape trees. It can impact virtually any species, though some, including sycamores, oaks, maples, ash and dogwood, are more susceptible

Oak processionary moth (OPM) is a dangerous pest that poses a risk to human and animal health. The Forestry Commission recommends surveying of oaks in the greater London area. Contact

We live in an age where computers increasingly play an ever-larger role in all facets of how we manage large amounts of information. Companies like Amazon and Apple use data

Join Dr. Donald Booth of Bartlett Tree Experts, The Rhode Island Land Trust, and the Bristol Conservation Commission on March 5th at Rogers Free Library to learn more about the