What is this on my peas? A: Aphids

These are aphids. There are a number of ways you can control them from insecticides to blasting them off with a stream of water. University of Memphis Director of Landscape Joellen Dimond goes through some of the options.
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Ladybugs Rescuing Us from Aphids – Garden Notes
Aphids on Tomatoes

Related Resources:
Aphids in home yards and gardens
Aphids and Their Management in Home Gardens