Pests in the Garden

In the early spring I found lettuce caterpillars and aphids. I researched and found the the answer to it all was planting Marigolds. Now it's late August and one of my cherry tomato plants is slowing dying. While cleaning out all the dead branches I noticed this little guy chilling.



I wondered if there were more and found another one dead and withered up. Not knowing what type of pest this was,I looked him up and I think it is a tomato hornworm.

After much research, it seems that the only two ways to get rid of them is to pick them off and drop them in soapy water, or dust them with a chemical. I will go with the soapy water for now.