I have a meyer lemon tree that has leaves with a white substance on the underside. This tree grows well produces fruit but I can tell something is wrong. there's this substance on the underside of the leaves and a blackish fungal looking stuff on the top of the leaves. There is fruit on the tree but its slow to ripen or turn yellow and some of the fruit has started to spontaneously rupture. The fruit also looks pitted discolored. I have treated it with neem oil in the past hoping for a less toxic insecticide but I think I may have to give up and get something stronger.
Does anyone know what this is?
