potato late blight

africa agricultural agriculture agriculturer agronomy algeria bacteria blight branch burn chlorosis country countryside curling death disease downy famine feed field food fungi gall green infestans irish late leaf leaves legume lesion line mediterranean mildew natural nature necrose necrosis north pathogen pathogens pattern phytopathogen phytopathology phytophthora plant powdery rust tuberculoi tuberculosis tumor vegetables wilt wilting