Hi Everyone:
Can someone please help me with an issue I have with a new Cogshall mango tree I bought. I am in the Phoenix, AZ area. Bought 4 dwarf mango trees with one being a nice, branched out Cogshall, 7 gallon. When I got it home I noticed a blackish, mold type dusty residue on some of the branches and leaves. When I rub the branches some of the stuff comes off on my fingers and when I wiped a branch with a little soapy water most of the black came off the leaves and branch. I called the tree nursery and I was told that the dust is harmless and will not hurt the tree; that it happens on some mango trees, especially in the heat of summer. After asking more questions they told me to bring the tree back for a refund. But it is such a beautifully shaped tree that I hate to take it back if this dusty black stuff is harmless ...... question is, is it harmless as I was told?