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Our system consists of potatoes resistant to Phytophthora infestans, a fungus-like pathogen that causes potato late blight, by creating a competitive inhibitor that can prevent the effector protein secreted by P. infestans from entering the potato cell. In case that the potatoes we genetically modified cannot fend off the P. infestans, we designed a soil based microbial fuel cell (SMFC) with engineered bacteria on the anode of the SMFC that can detect whether the potato tuber is infected or not. If the potato is infected and detected by our SMFC, we will spread defensin, an antimicrobial peptide isolated from maca (Lepidium meyenii). The defensin can weaken and inhibit the growth of P. infestans without doing harm to the environment since it does not contain heavy metals like most fungicides.