2015 Fungicide Resistance Management Booklet Now Available

Nathan Kleczewski Ph.D

Extension Specialist- Plant Pathology
Assistant Professor
Department of Plant and Soil Sciences

Fungicides contain active ingredients with a specific mode of action.  The mode of action typically refers to a particular physiological process essential to the fungus.  For example, fungicides in the group 7 (SDHI) class impact energy production by inhibiting a process at one point  of the energy production pathway, whereas the group 11 (QoI) fungicides impact energy production by inhibiting a different part of this same pathway.  Other fungicides can prevent DNA replication, RNA production and signalling, cell division, cell wall synthesis and integrity, and other processes important for the survival and reproduction of fungi.  When fungicides on the same class are applied repeatedly in a location it can result in a buildup of individuals with a natural resistance or tolerance to the fungicide in the population.  This resistance results in a general lack of fungicide effectiveness for this particular fungicide class in the future.  One way to avoid resistance issues is to rotate among products belonging to different fungicide classes and to understand the resistance risk of a particular fungicide.

Each year we put together a fungicide resistance guide with the cooperation of plant pathologists throughout the mid-Atlantic and Northeast.  This guide is an excellent resource for those growing vegetables and utilizing fungicides during the growing season.  A pdf of the guide can be found by clicking the link below:

2015 FRAC Guide

Source:udel.edu