Preventive control of powdery mildew disease of mango

Abstract EN

Oidium mangiferae Berthet was found to be associated with the powdery mildew disease ofmango.

The air-borne conidia are released from the old tissue harboring the dormant fungal hyphae under favorable weather conditions, which produce the disease, ?roper forecasting of release of airborne innoculum significantly reduced the required number of sprays needed for chemical control.

Spore traps were used to monitor the concentration of airborne conidia during the months of February, March and April 1996 and 1997.

Daily temperature and relative humidity were noted and the spore counts from the spore traps were correlated to the meteorological data.

There was a positive trend between rising temperature, lowering relative humidity and number of spores in the air after غ low temperature, high humidity and cloudy spell of weather.

The maximum spore occurrences were noted around 23°C and relative humidity of 40-60%.

It took 5-8 days for the emergence of disease symptoms after the first detection of airborne conidia.

Ten ftmgicides were tested on three mango varieties (Fangra, Dashehari, and Anwar Retol).

The preventive sprays at the stage of first detection of air born conidia were effective in controlling the disease.

Optimal timing of two sprays of ftmgicide were sufficient to provide preventive control (>90%).

The susceptibility of inflorescence varied with its developmental stage.

Froper forecasting reduced the number of’ sprays 7 ٢٥٥١؛ to 2 or 3.

There was no varietal difference in incidence of the disease or response to ftmgicide applications.

During the course of this study, we identified seedling plants which consistently showed resistance to powdery mildew.