powdery mildew

agricultural agriculture agronomical agronomy algeria algiers antrachnosis ascochyta bean chemical damage disease diseased environment erysiphe fabaceae farm field food fungi fungicide fungus garlic green greenhouse health healthy ill intensive leaves legume life loss losses malva microbiology mildew modern mycelium mycology natural nature organic pathological pathology pea pest phoma photosynthesis phytopathology pisi plant powder powdery production rust rusty sick spp teliospore treatment uredospore weed white