Leopold Center
U.S. Department of Agriculture



Fire blight is one of the most frustrating and devastating apple diseases in Midwestern orchards.

This disease is difficult to manage because very little is known about the bacteria that cause it.

Few resistant varieties exist, thus the most important method for control is streptomycin sprays. The use of weather-based disease-prediction models to time these sprays can reduce the number of sprays. One currently-used model is called MaryBlyt.

Email: mgleason@iastate.edu Telephone: (515) 294 0579 Address: 312 Bessey Hall, Iowa State University, Ames IA 50011