Am asking this question partially on behalf of a homeowner I worked for: She has a large Comice pear tree (25 feet high) that seems partially burdened by pear scab and partially burdened by a fungus (incomplete identification there, sorry).......

The leaves are small and the vegetative component seems quite scarce, giving the tree the appearance of being rather depleted of health and vitality, although the tree still bears suitably sized pears.

She has never put any sort of fertilizer on the tree or the soil.

With an incomplete diagnosis like that is possible to say that it would be worth trying to put a nitrogen fertilizer near the drip line to try and see if one can green up the tree a little bit more and see if that could add to the vitality?

thanks.