ISHS Acta Horticulturae 273: V International Workshop on Fireblight
PREDICTING APPLE BLOSSOM INFECTIONS BY ERWINIA AMYLOVORA USING THE MARYBLYT MODEL |
| Author: | Paul W. Steiner |
| Abstract:
MARYBLYT is an empirically derived, comprehensive model for fire blight disease management that anticipates and identifies infection periods and predicts symptom appearance for four distinct phases of fire blight on apples: blossom, canker, shoot and trauma blight. Five strict requirements governing apple blossom infection by Erwinia amylovora have been characterized: (1) flowers must be open with petals intact; (2) accumulation of at least 110 degree hours >18.3C from full pink; (3) a wetting event as rain >=0.25 mm or dew or >=2.5 mm rain the previous day; (4) an average daily temperature of >=15.6C; and, (5) all of the above in the sequence shown. Symptoms usually appear 50 degree days >12.7C after infection. | |
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