K wrote or quoted:

Incidentally it seems possible that pinching out
the young male catkins from Morus Nigra specimins
could result in more resources being available
for the fruit. I wonder if this hypothesis is
reasonable, and whether it has been tested.

Do you still get fruit if you pinch out the male catkins?

Maybe:

``In monoecious species with male and female flowers
on the same tree, pollination typically requires
pollen from a different tree because the maturation
sequence of male and female flowers on the same tree
is incompatible.

Some species and varieties produce fleshy, seedless fruits
without pollination. These fruits are called parthenocarpic
because they mature without pollination and seed formation.''

- http://waynesword.palomar.edu/fruitid6.htm

Why a tree would bother to produce fruit without
seeds seems puzzling - perhaps it doesn't happen
naturally very frequently.
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