I would post this question over at the tomato or vegetable forums.

Yes I've been having problems with my tomato plants. Aphids mainly. By the tim you notice the little brown patches developing it my already be to late. I use a table spoon of vegetable oil with a tablespoon of dish detergent. Mix in one gallon of water and spray. The leaves that are brown to late to help those. But the plant will grow back. But will it this season?

Sorry, that 4 table spoons per gallons. One per those little hand sprayers.