Abstract
A number of sensor types were fabricated and tested for theirelectrical resistance changes to compounds known to be evolved by potatotubers with soft rot caused by the bacterium Erwinia carotovora. Onthe basis of these tests, three sensors were selected for incorporation into aprototype device. The device was portable and could be used without computercontrol after threshold values and sensor settling criteria had beendownloaded. The prototype was assessed for its discriminating power undersimulated storage conditions. The device was capable of detecting one tuberwith soft rot in 100 kg of sound tubers in a simulated storage crate. Thedevice was also able to detect a tuber inoculated with E. carotovora,but without visible signs of soft rot, within 10 kg of sound tubers. The samesystem was able to follow the progression of the disease in a tuber storedamongst 10 kg of sound tubers when operated at 4 °C and 85% relativehumidity (conditions typical of a refrigerated storagefacility).
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