What are the black spots on the leaves of my Mango plant?
I've been growing a Mango seedling for about 6 months now. It is in a small greenhouse in a southfacing window (I live in The Netherlands, zone 8). Today I noticed all leaves except the youngest ones were covered in a sticky sap (which I wiped off) and there were black spots all over the bottom of the leaves. Is this a kind of mold or pest and is there any treatment? I hope anyone can help me!
Certified GKH Gardening Expert
It seems to be bacterial spotting. It could have been caused by insects, as this is a common source for bacterial infections, but overwatering is also a common way to introduce the infection.
Make sure that the saucer never contains sitting water. Always pour out any excess. Now would be a good time to pot it up into a slightly larger container, being mindful not to overwater in the new container.
A fungicide can be a good treatment option, as well as cutting heavily infected growth. Leaves will be replaced, so stopping the spread of the infection is worth the temporary mangled look.
This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
This article will give you an idea of what kind of care mangoes need: https://www.gardeningknowhow.com/edible/fruits/mango/mango-trees-in-pots.htm