Small Greenish Bugs on Plants
These are most likely Green Peach Aphids. Also known as "plant lice", aphids are found in every part of the country. They are probably the most common pest to attack young transplants. Aphids reproduce like crazy, as females do not need males in order to reproduce!
Often plants grown in containers will suffer from this condition. Eggshells burried in the hole with the plant will release calcium as they break down and can also help prevent Blossom End Rot.
Outdoors:Ladybugs and predatory wasps are wonderful predators of aphids and will probably keep them under control on plants grown outside, once the weather has warmed up a bit. For low levels of aphids, knock them down with a strong spray of water. For higher populations, use Insecticidal Soap. They key for success is doing multiple successive sprayings.
Indoors:Bugs love to come indoors, especially aphids. They can be easily controlled with Insecticidal Soap. They key for success is doing multiple successive sprayings. Spray your plants once or twice before you bring them in, and then another 1-2 times indoors. The shower makes a good spray-down location.
Pests are attracted to "weaker" plants, those that are malnourished or are under some sort of stress. Be sure that your fertilizing regimen is adequate.
For higher levels of aphids outdoors, or if the insecticidal soap is ineffective, beneficial insects may be the answer. We use them exclusively for pest control in our greenhouses. These are insects which occur naturally, but because our greenhouses are enclosed they don't readily find their way in. Beneficial insects are killed off by the use of synthetic pesticides - while synthetic insecticides do kill the "bad guys", it also kills a lot of the "good guys". Unfortunately the "good guys" take much longer to bounce back than the "bad guys". Our recommendation is NEVER to start with synthetic pesticides, as it sets up problems all along the way. Some great beneficials for aphids include Ladybugs, Lacewing larvae, Aphidoletes, and Aphidius.