Abstract: Assessing the intensity of diseases with the spread of bacteria among plants through a trivariate stochastic model is proposed in this study. The parameters of disease spread are varying with the type and stage of the plant. This study has considered three stages of plants namely Nursery stage, Transplantation stage and completely grown/Yielding stage as three variates for getting the joint probability functions. Stochastic differential equations were formulated through trivariate point processes for deriving several statistical measures based on the proposed parameters of bacteria growth, spread and loss. Model behavior was observed through the sensitivity analysis. The statistical measures based on moments are obtained for varying values of single parameters when all the remaining parameters are unchanged.