Occurrence and Control of Strawberry Powdery Mildew in Al-Shoubak/ Jordan

Powdery mildew of strawberry caused by the fungus sphaerotheca macularis f. sp. fragariae was found in al-shoubak area under glasshouse conditions. white superficial fungal growth was more abundant on the lowerthan the upper leaf surface and no cleistothecia were noticed on any plant parts. top leaves were moresusceptible than middle or bottom leaves. strawberry cultivars albion and camarosa were artificially inoculatedwith the fungus under growth room conditions. disease incidence and severity were 46.7% and 50.8% in cv.albion and significantly different from that (1.6% and 5.2%, respectively) in cv. camarosa. in vitro leafletbioassays and a runner-tip plantlet experiment were done to assess the influence of some fungicides andresistance-inducing chemicals in controlling the disease. canvil was significantly effective in controlling thedisease while sulfur, triadimefon, mycozim and punch were only effective at the high application rates. bothcalcium chloride at 1 g/l and hydrogen peroxide at 10 mm were effective in controlling powdery mildew onstrawberry.