AUTHORS: R. Amelia, N. Anggriani, A. K. Supriatna

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In this study, we developed a model of yellow viral disease of red chili plants that are spread through whitefly bugs (Bemisia tabaci). In addition, we used optimal control theory with Pontryagin's minimum principle to determine the optimal control of Verticillium lecanii (V. lecanii) applications so as to minimize the costs incurred in reducing the intensity of the spread of yellow viral diseases. The results showed that V. lecanii was sufficiently applied for 15 days with the application of 90% of the prescribed dose to minimize the costs incurred by farmers in the cultivation of red chili plants.

KEYWORDS: -Optimal control, Pontryagin’s Minimum Principle, Mathematical Modeling, V. lecanii, Yellow Virus, Red Chili, Plant Disease.

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