Help My Hibiscus Plants

Question

My hibiscus plants have a whitish, velvetish dust that is on the stems at the tip. It forms a blanket. I have noticed that the new buds are getting brown and falling out. If they do grow into flowers, it is deformed.  I’d like to get rid of whatever pests naturally.

Answer 1

The plant grows and blooms well at 18-20 degrees Celsius. The temperature must not fall below 10 degrees Celsius in winter. Needs full light and can adapt gradually to full the sun. During the summer, the plant needs large amounts of water.

Diseases and pests: Rust occurs in the form of blackish brown spots. Gray mold damage the buds and flowers. Avoid excess moisture with a good ventilation of the plant.
The plant is attacked by lice and red spider. Apply an insecticide treatment associated with an acaricide, plus a systematic fungicide Rubigan 0.01% every 10-14 days, for a minimum period of a month.

Care: Trim the plants every spring, and shorten the ramifications. Water the plant whenever the soil in the pot dries. Fertilization is required at least two or three times a month. During winter, reduce watering to promote the sleep of the plant.

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Answer 2

It is powdery mildew. This article will have some suggestions for getting rid of it organically:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm