downy mildew of artichoke

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