Papaya Trees With Fungus and Yellow Leaves

Hey guys,

We have a young grove of Papaya here in Thailand , and the first fruit is showing, but we are having a bit of trouble.

Some of the lower leaves are yellowing , and wilting, falling off.

Also , we are having some young fruit fall off with a fungus on them.

I wonder if you can offer some advice as to what this might be?  pictures attached

Thanks so much