pests in the greenhouse

OK knowledgeable people. I've got aphids in the greenhouse on the nursery
crops. Yes, I'm going to consult my books but I wanted to check with those of
you who are used to dealing with this sort of thing.

The pests aren't bad yet, and I want to get rid of them, but I don't want to
injure these plants. They are VERY tender and still growing their root
systems. I just found a couple of aphids truthfully, so I squished them.
However, where there's one or two......................so what can I do to
kill them but not the plants? Should I spray in the evening? Should I try
something organic first? remember, this is part of my livelihood for the
year.

THANKS!
A


Andrea H
Beaufort, SC
Zone 8b

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