What’s Killing My Hibiscus?

Question

The leaves developed white spots that are surrounded by a brown ring. The leaves shriveled and died. While the plant continued to produce vibrant flowers, some of the flowers died before they bloomed. At different times, I treated the plant with Neem oil, fungicide and pesticide. Nothing stopped the destruction.

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Answer 1

It is likely a bacterial or fungal leaf spot disease. Immediately pick off the infected leaves to stop the spread. If the hibiscus is in the ground, remove any fallen leaves and discard in the trash. These articles should help:

https://www.gardeningknowhow.com/ornamental/hibiscus/hibiscus-disease

https://ipm.ucanr.edu/home-and-landscape/leaf-spot-diseases/#gsc.tab=0