{"id":29781,"date":"2024-08-21T09:00:42","date_gmt":"2024-08-21T13:00:42","guid":{"rendered":"https:\/\/www.purdue.edu\/fnr\/extension\/?p=29781"},"modified":"2026-04-24T15:40:23","modified_gmt":"2026-04-24T19:40:23","slug":"the-summer-of-triclopyr-purdue-landscape-report","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/fnr\/extension\/the-summer-of-triclopyr-purdue-landscape-report\/","title":{"rendered":"The Summer of Triclopyr – Purdue Landscape Report"},"content":{"rendered":"

Purdue Landscape Report:<\/a> There have been a significant number of questions and problems regarding triclopyr that have come up this growing season.<\/p>\n

\"Figure<\/a>

Figure 1. Confirmed damage from triclopyr on sassafras shows the growth regulator-type injury on leaves. Photo courtesy of the Office of the Indiana State Chemist.<\/p><\/div>\n

Several of these problems have come through the Purdue Plant and Pest Diagnostic Laboratory<\/a> from landscapers, nurseries, and property managers.<\/p>\n

General Information about Triclopyr
\n<\/strong>Triclopyr is a selective systemic herbicide belonging to the pyridine class. It is primarily used to manage woody plants, vines, and some broadleaf weeds. Unlike glyphosate, a broad-spectrum herbicide, triclopyr specifically targets the growth hormones in dicotyledonous plants, making it effective in controlling species that are difficult to manage with other herbicides. It works by mimicking plant hormones, disrupting normal growth processes, and leading to the death of the treated plant (Fig. 1).<\/p>\n

What Triclopyr Controls
\n<\/strong>Triclopyr is utilized in various settings to control unwanted vegetation. It is effective against species such as:<\/p>\n