Question about my leaves

[Datperson]

[FONT=Arial, Helvetica, sans-serif]I got some problems with my leaves and have some questions,

What it is?

What can i do to fix it?

How can i prevent this from happening again?


Image 1

Image 2

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[GreenMachine22]

Try posting in this section https://www.icmag.com/ic/forumdisplay.php?f=83