Powdery mildew  

Damage symptoms appear on the upper surface of the leaf as white or yellow spots. With continued feeding, these spots turn brown.  

Symptoms begin on the lower leaf surface, then spread to both sides, appearing as white, flour-like spots. This white powder consists of conidial spores and their carriers of the fungus that causes the disease. ​  

As the infection progresses, the affected tissue turns brown due to tissue death.  

In severe cases, leaves tend to curl upward, eventually wilting, drying, and falling off.  

Flower clusters may wilt, and fruit set is reduced.  

When fruits are infected at the early formation stage, their growth stops and they become covered with a white layer.  

If infection occurs at a later stage, fruits grow abnormally, dry out, turn an unnatural color (brown to black), often crack, and fail to ripen under severe infestation.