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Study of the Passive Electrical Properties of Tomato Tissues after Infection and Treatment by Fongicide


  • Department of Physics, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
  • Department of Biology and Vegetal Physiology, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon


Objective: To propose a method of electric detection of a biotic stress before the visible apparition of the symptoms on the plant leaflets. Methods/ Statistical Analysis: By using Cole’s model of cell, we study the behavior of extra-cellular space resistance according to time of four groups of tomato leaflets and make comparison of those different behaviors. Findings: It appears from our analysis that the maxima of resistances leaflets which are infected by mildew and not treated increases gradually and tends to infinity. The infected plants (sick) and treated with the ridomil MC have a relatively low electric resistance level compared to that obtained in the infected and untreated plants. Whether the plants are infected, infected and treated, or healthy and treated; the maxima of resistances were higher than those in pilot plants (untreated and uninfected). The data shows that the disease destroys continuously the physiological state of the plant until death, which corresponds to the higher values of the extra-cellular space resistance peak; the fighting of fungicide against the disease within the plant organism has an impact on the physiological state of the plant which is revealed by the decrease of the extra-cellular space resistance peak. Application/ Improvements: The objective being to contribute in obtaining a bank of numerical resistance values allowing improving the symptomatic methods of detection of the sick plants by the seeing and by the chemical analyses.


Electrical Resistance, Fungicide, Mildew, Physiological State, Ridomil M.C. Cole’s Model of Cell, Tomato

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