Pesticides are an essential tool in protecting plants from harmful pests, diseases and weeds. It’s crucial that those involved in the production, distribution and application of pesticides understand the importance of adhering to regulatory standards. In this article, I’ll [...]

  Part 1 of this two-part series, “Heartwood and Heart Rot, Part 1: Are They Important to Arborists?” ran in the May 2023 issue of TCI Magazine. Photo 1: Heart rot is simply decay in the center of the stem [...]

An elm zigzag sawfly (Aproceros leucopoda) larva feeding on an elm leaf. Photo by Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org. Given the hundreds of thousands of elms already lost in the last 100 years to Dutch elm disease, it [...]

This article is the fifth in a series for TCI Magazine by the author designed to help arborists understand and diagnose problems caused by insects and mites on woody landscape plants. The first article, “Basics for Diagnosing Problems Caused by [...]

Armillaria mellea, this one growing on a maple in the month of September, is an autumn-fruiting mushroom. Mushrooms that appear in the spring or summer are almost always not A. mellea. All images courtesy of the author. Just like the [...]