potato late blight

africa agricultural agriculture agriculturer agronomy algeria bacteria blight branch burn chlorosis country countryside curling dead death destruction destructor disease downy famine feed field food fungi fungus gall green health healthy hunger hyphe infestans irish late leaf leasions leaves legume lesion like line mediterranean microbe microbial microorganism mildew mycelia mycelium natural nature necrosis north oomycete pathogen pathogens pathology pattern petiole phytopathology phytophthra plant potato powdery rust security sound stems symptoms threat tissue unhealthy unsound vegetables wilt wilting