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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comwhat causes the leaves to turn black
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URLs in this post:
[1] http://ucce.ucdavis.edu/files/datastore/530-15.pdf: http://ucce.ucdavis.edu/files/datastore/530-15.pdf
[2] https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
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1 Comment To "Grapefruit tree"
#1 Comment By Downtoearthdigs On 08/16/2017 @ 10:40 pm
This is likely Sooty Mold, which is caused by Aphids or Scale insects.
These articles will help you.
http://ucce.ucdavis.edu/files/datastore/530-15.pdf [1]
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm [2]