ISHS Acta Horticulturae 273: V International Workshop on Fireblight
COMPARISON OF THE MARYBLYT PREDICTIVE MODEL WITH THE BILLING REVISED SYSTEM FOR BLOSSOM BLIGHT RISK ASSESSMENT IN APPLE. |
| Authors: | T. van der Zwet, G. Lightner, J. Walter, P.W. Steiner |
| Abstract:
The Maryblyt model was compared with the Billing revised system for the prediction of blossom blight infections on ‘Jonathan’ apple at the Appalachian Fruit Research Station from 1984 through 1989. Temperature and rainfall data, combined with epiphytic inoculum potential, systemic canker activity, and symptom indices were plotted with a graphics research model, presented at the 1986 workshop. Infection risk scores and disease development periods of the Billing revised system, based on potential daily doublings of Erwinia amylovora (Burr.) Winsl. et. al., were plotted along with the graphics representing the four basic requirements of the Maryblyt model. Comparing years with severe, light, or no fire blight indicated the two systems were complementary. However, the specificity of the Maryblyt model appeared more accurate in anticipating infection periods. | |
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