You know you can just wipe them off with your hands/fingers - squishing as you go. They skim right off the stems and leaves with minimal pressure. No risk to plant damage that way.

Or you can just blast them off with a sharp stream of water. I wouldn't over-do it with the soap and pesticides sprays as it is easy to kill the plants that way.

Or you can bring out the big guns of course if you prefer but it takes a mighty big infestation of aphids to warrant that approach IMO.

But most important is to discover why they are ganging up on your plants - excess nitrogen fertilizer perhaps?

Dave

Here is a link that might be useful: Aphid cures

Some ppl also recommend lady bugs, which eat aphids and their larvae.

I'm trying aluminum foil under some of my plants this year, to confuse the whiteflies. It's supposed to help with aphids, too. Silver mulch would be better, but I don't have any.

The foil can look alarmingly bright, especially in 103 degree heat like we had yesterday. Plants look fine, though.

I'm a fan of squishing aphids, especially if they're on new growth. If my plants are big enough, sometimes I remove some of the new growth.

Whenever I find a ladybug larva, I move it over to my tomatoes. The larvae eat way more aphids than the adults.

I had huge aphid problems last year (no plant damage, just tons of aphids). Luckily, the problem is much less this year and I've only seen a few aphids.

Of course, since the aphids aren't a problem this year, the flea beetles have to take over and put tons of holes in the leaves. But even that is starting to die down a bit.

Another vote for ladybug larva and also, hoover fly larvae. I walk around my yard and look for babies and place them on infested plants. They clean them up in a couple of days. Works great and its free.

i haven''t tried this 'cause I read about it today. The article said if the plant is strong, use one of those sticky lint rollers for aphid control. I'm not sure how it would work on the flimsy leaves of a tomoto though.
I personally am a fan of the ladybug method. Those little buggers cleaned up an aphid mess last season in a day!