The insects you have are aphids. They like humid conditions in a warm greenhouse. They also transmit a number of viruses. Aphids are easily contolled with many insecticides - one I have used is available at Home Depot and many other outlets. It's a pre-mixed product (small bottles with squeeze sprayer) containing pyrethrum which works well. Malathion and many other insectices also work well. It is sometimes recommended to simply spray aphids away with a strong hit of water from your hose - I wouldn't recommend this inside a greenhouse since it doesn't kill the aphids and will likely only spread them to other plants.
Dave Palzkill
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