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From HortiDaily: "In a few countries, bumblebees are not available and manual pollination must be used... It pays to remember.. that without proper pollination a tomato plant will not produce premium fruit.
When tomato plants are pollinated manually, the best method is by using electric bees. These are battery operated vibrators. Staff must vibrate every plant in the glasshouse three times per week "

Tomatoes won’t ripen right
without pollination.
It helps to have a bumblebee
to give that good vibration.
But if you lack the bumble,
there’s another way, you see:
Your plants all can be pollinated
manually.
You will need to use some labor,
and wield a good *******--
the electric bee will soon become
your best-loved pollinator.
Your fruit is premium
and you’ll want to keep its savor.