Abstract
An Apple Scab Alarm was constructed that senses temperature and the duration of surface wetness, then electronically combines these data and displays the result as a single number representing the potential severity of apply scab infection. The performance of the Alarm was compared to independent estimates of potential infection severity which utilized temperature data from a thermohygrograph and surface wetness duration data from a deWit Leafwet Recorder or an electrical impedance grid. Except for two occasions when errors of about 2 h appear to have occurred in the detection of surface wetness duration by the deWit recorder, the independently calculated estimates agreed with the Alarm display within 8.6% during 18 periods of rain or dew.
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