Ein elektronisches Schorfwarngerät

Construction of an electronical scab warning apparatus The control of the apple-scab in Germany needs an average of 10–15 treatments a year. In order to minimize the pollution of the natural environment and to determine the optimal time of infection an electronical scab warning apparatus has been developed. The system consists of a console, housing the electronic and data display components, and a sensing unit. The sensing unit, placed in the orchard, monitors duration of foliage moisture, temperature, and humidity. These data are processed and stored electronically in the console. The influence of humidity during periods when the foliage is dry, which determines how long the dormant fungus remains viable, is also taken into account. The console can provide an accurate read-out of fungus growth at an stage, and indicates the exact moment for most effective spraying. The basis of this construction is an elarged Mills-table, which enables to determine the infection time according to temperature and moisture on the leaves.