Ali Raza

Powdery mildew of cereals:- Casual organisms:- Blumaria graminis Symptoms:- Very much alive in all type of cereals. The fungus growth appear on the upper surface of leaves. The fungus develop many superficial colony. Fungus produced flocculent growth at first it is white growth. When conidia are produced the color will change grayish to white. Disease leaves not shed but wrinkled rate of photosynthesis is low. Leaves deformed, twisted and wrinkled. So transpiration and respiration in infected plant increase but photosynthesis consequently decrease. Disease cycle:- The pathogen is soil born in form of cleastheia It can survive 13 year in temperate climate condition of low temperature Ascospores produced best at 18°C-20°C For the growth of conidial spores optimum temperature is 15°C low temperature 3°C Management:- Cultivation of mixed variety delay the chances of powdery mildew Treatment of crop stubbles management recommended Use of symptoms fungicides vitavex Use of triozole fungicides little Payton and Bealeton @ 0.1-0.2% gives 100% control For 42 days when used as seed dressing and foliar spray But some a virulent strain B.grminis hordei induced systemic resistant against virulent strain of pathogen