drying of hibiscus flower buds

Question

I have some 7-8 hibiscus plants in pots. For the last one year, the buds of these plants, after being there for some time, suddenly become yellow and then dry and drop off. I tried many insecticides and other sprays but without any success. Please advise.

Answer 1

It sounds like it may have thrips. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm