Mung Beans living down to their name

These Mung beans or Green Gram as they are known here, have been smashed by Powdery Mildew, the trial area has received less than 5mm of rain and still the PM has destroyed the crop, I am taking the approach that if a crop requires fungicide then it is not considered as the small holders don't have the capacity to be spraying multiple times. Lucky its a trial.