ISHS Acta Horticulturae 338: VI International Workshop on Fireblight
EFFIFACY OF THE MARYBLYT FORECASTING SYSTEM TO PREDICT BLOSSOM BLIGHT IN WEST VIRGINIA (1984–1992) |
| Authors: | T. van der Zwet, G.W. Lightner |
| Abstract:
Blossom blight predictions were made with the MARYBLYT forecasting system in 6 years (1987–1992) during the 9-year period reported here, whereas the prediction model was applied in retrospect to the 3 years 1984–86. The largest difference during the six years of blossom blight predictions was one day in 1990. No, or negligible, blossom blight occurred in four years (88, 89, 91, 92), whereas only moderate blight appeared in 1987 and 1990. In 1984 and 1986, symptoms appeared at 48 and 24 hrs, respectively, after blossom blight was predicted, whereas 1985 proved to be the most severe blossom blight year in nine years. That year, four infection events occurred during one week in April (full bloom) when the temperature averaged 21 C (70F). The first MARYBLYT symptoms were predicted one day after earliest symptoms were observed on blossom petioles. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
