infected cereal leaf

affect africa agent agricultural agriculture agriculturer agronomy algeria america attacked blight blister blotch blumeria boil burn causal caused cereal cereals chlorophyll chlorose chlorosis common conidia country countryside curling destruction disease diseased downy etiolation famine feed field flower fongicide food fungi fungus gall graminicola graminis green infected leaf least leaves line maize maydis mediterranean mexico mildew mushroom mycosphaerella natural nature necrose pathogen pathogens pattern pesticide phytopathology plant pycnidia pycnidium safety security septoria showing spore spores symptom tissue tritici two wheat zymoseptoria