Q.Grapefruit Tree
The leaves and branches are covered in sticky stuff and there are brown blobs all over it. The leaves are dropping too.

Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 9, 2011
Sounds like you have a scale infestation. Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
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