Help diagnosing mango leaves

[stephen]

Hi, everyone! I hope you're all well. Just wondering if you can please help me figure out the cause of these black spots on my young mango tree that I just received. Are these something I should be concerned about? If so, what should I do to treat them? I'd appreciate your wisdom. Thank you!

[Oolie]

Looks like anthracnose, a common issue for mango trees.

[stephen]

Would you go ahead and spray it with copper?

[Oolie]

The damage is done, if it doesn't spread you should have no issue. Not like we will see rain again for 3+months, plenty of time for new flushes to harden off. Just make sure not to supply overhead watering, and you should be golden.

[stephen]

Thanks, Oolie! I'm so new to all this, so I don't really know how anthracnose works. Is the fungus there on my plant, ready to spread when the right conditions come? If so, would it be wise to go ahead and spray the plant with copper so it at least protects the unaffected areas from future damage?

[Oolie]

Apply the spray before rainy periods, because fungicides can protect only healthy tissue and don’t eradicate existing infections.

http://ipm.ucanr.edu/PMG/PESTNOTES/pn7420.html