The only real hassles with Moravsky Div and Stupice as female
breeding partners is the tiny, tiny, thin pistils in the center of a
flower. Twitch while trimming anthers, and your work with that
flower is history, you broke the pistil. They are like the pistils in
the flowers of most cherry tomatoes.
Other than that, they make good breeding partners because they
are both PL (easy to tell in the F1 if the cross with an RL pollen
donor was successful) and they are both very early, which should
produce some F2 plants earlier than Black Cherry.
If I have the pollen (flowers producing pollen), I will pollenate 3 times,
2 days apart. Once when I first trim the bud, in case it is already
sticky enough for pollen to stick to the end of the pistil, again a
couple of days later, and once more another 2 days later. If that
does not do it, forget it, try another flower.
I also like to trim 3 flowers on a cluster, if there are 3 there of
appropriate maturity (almost ready to open, judging by the size).
Then I have a better chance of getting a crossed fruit, and it is
easy to remember where they are. I trim off the corollas, too, the
leaves around the top of the flower, to make them easier to identify.
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