Q.Gardenia plants
My gardenia is losing its leaves that are turning dark and falling off. Looks like cobwebs with little brown spots in them.

Downtoearthdigs
Answered on February 7, 2017
It sounds like a combination of pests, Aphids or Mealybug and Sooty Mold.
Neem Oil should be used to treat the plant.
Here are some links to help you.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-pests.htm
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