Q.My Bougainvillea’s Leafs Are Becoming Black And The Flowers Are Becoming Gray
The disease is progressing quickly and it appears to be affecting in less extend my others bougainvillea.

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on May 6, 2020
This looks a bit like Alternaria! This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/alternaria-leaf-spot.htm
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