Grapefruit tree

what causes the leaves to turn black

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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]

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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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