CARBOHYDRATES CONTENTS IN RELATION TO REACTION OF MANGO TO POWDERY MILDEW AND ITS CHEMICAL CONTROL

BARAKA, METWALY A.; SALLAM, ABDEL-AZIZ A.; MAHDY, REFAT M.

doi:10.21608/ejar.1994.452073

CARBOHYDRATES CONTENTS IN RELATION TO REACTION OF MANGO TO POWDERY MILDEW AND ITS CHEMICAL CONTROL

Document Type : Original Article

Authors

¹ Faculty of Agriculture, Suez Canal University, Egypt

² Plant Pathology Research Institute, Agricultural Research Centre, Giza, Egypt

10.21608/ejar.1994.452073

Abstract

Mango varieties differed in reaction to powdery mildew. Zebdia and Dabsha were less susceptible to infection, compared to Sinara Hindi, White Shamam, Balady and Paine. Taymour and Sokari Momtaz are the most susceptible. Total sugars in healthy young leaves of the less susceptible variety (Zebdia) were lower than in the highly susceptible variety Taymour. Zebdia variety exhibited higher amounts of reducing sugars than the highly susceptible Taymour. Resistant old leaves of the two tested varieties contained less total sugars than the highly susceptible young leaves. On the other hand, infection with powdery mildew reduced total and reducing sugars and chlorophyll content compared to healthy ones. In field tests with 12 fungicides, the best control of powdery mildew (Oidium mangifera) was achieved with Calaxin, (tridemorph) Kara-than 35% (Denocap), Nimrod (Bupimate), Sunlayton (triademifron), Tilt-250 (propiconazole), and Rubigan (Fenarimol).