Insects that eat leaves?

I have recently started a vegetable garden, and I have some sort of pest eating the edges of my Lima bean leaves and tomato plants. The insect that I have seen the most of resembles some sort of mosquito. What could be eating my best plants and how do I combat them. I prefer an organic solution, but if the problem worsens I may have to result to Seven Dust.

Thanks

 

Try spraying the plants with a soapy water solution.

 

Should I add anything else, and will antibacterial dish soap be harmful at all?

 

I just use what ever dish soap I have at the time, what ever is on sale, any soap will work, If you have earwigs soap also kills them as well.