I was so sad when spider mites invaded and infested my tomato and squash plants. I am against spraying pesticides on food I'm going to eat and I found out that most "natural" pest control oils and sprays run 13-18 dollars at Home Depot. I saw that all those organic sprays contain is canola oil and water and 4% "emulsifier." So I saved my 15 dollars and I mixed 2 cups canola oil, two tablespoons dish soap (as an emulsifier) and 2 gallons water. I used a cheap pump type sprayer. remember to shake well to mix before spraying. This worked great on the spider mites and will work on aphids and other creepy crawlers that want to destroy your plants....and saved me some money!