Young Mulberry tree, dying leaves.... (Brown/Yellow spots)

[Legion739]

Hi, I'm from Cape Town, South Africa

Earlier this summer me and my GF planted 2 Mulberry trees (Morus nigra)

and they have both almost doubled in height in less than a month (probably only 1m high now)

I worked a lot of compost into the ground around them that I mixed 50/50 with the sand so I believe they have lots of nutrition in the ground and their root system was very strong from what we could see when we planted them.

I noticed some of the leaves are turning brown/yellow I'm not sure if this is a fungus or something.

Plant Nr1 (let's call him Link)


Plant Nr2 (and let's call him Rhett)


Rhett's is quite skinny and long and has been growing fast. the leaves look very healthy and the growth points are a nice lime green color, the only issue is those brown / yellow spots on the leaves and the lower down leaves dying from it.

Link is much shorter and has been growing a bit slower and is a lot more bushy, Link also has the same brown / yellow spots killing the leaves. Link's leaves also seem a bit strange to me, it seems like the edges are folding over (like forming a upside down bowl) and aren't as flat as I know Mulberry leaves to be

What could be causing this ? what can I do to help Rhett and Link ?

[applestar]

Since they look otherwise healthy, I'm wondering if the damage could have been caused by strong wind lashing those particular leaves against something? Is that likely?

Another possibility I thought of is dog or cat urine splatter, but that might cause more extensive burn than this....

[Legion739]

It could be wind as Cape Town is known for very strong winds. but half way up I have the plants supported. I doubt it's our dogs urine someof the burnt leaves are to high up but It could be a possibility as I have seen the dogs pee there

At this point I think it might be a fungal infection as it's the only thing that makes scene to me, some of the 1st plants leaves are curling around a bit on the edges and look "swollen"

I'll go pick up some anti Fungi spray or something at a nursery and see if it helps.