Oops, meant to say "the ones in the STORE are petroleum based".

I know a number of people who use PAM cooking spray on waterlilies for aphids. I think PAM is vegetable oil based? I would experiment first on a small area.

Heres a link for a recipe for using canola oil as dormant oil spray. I read somewhere that canola oil has some insecticidal properties. Not sure what the proportions would be for summer weight spray but probably not too hard to figure out.

Here is a link that might be useful: A less toxic dormant oil spray

What kind of bugs are on your tomatoes? Hornworms?

...just visiting...suggest the Gardens Alive Catalogue for horticultural oil products (canola;cottonseed oil). I would imagine their fomulations (which might include specific adjuvants)have passed series of testing...
http://www.GardensAlive.com

Pablo, our tomato bugs, Cyrtopeltis modestus, are not worms, they are true bugs, insect order, Hemiptera.

Kat, thanks for the Canola oil info and recipe for dormant oil.
(Not sure what the proportions would be for summer weight spray but probably not too hard to figure out.)
Actually, I wouldn't know how to figure how to make this into ultrafine, having no prior experience w/ oil sprays, and would appreciate if anyone could share their tried and true homemade recipe.
Thanks!

Sorry, I have not used any oil based spray's lately cause I have a west facing balcony in central TX and it gets HOT! But until I burned some plants by spraying neem oil in the late afternoon (which is the hottest time of the day on my balcony) I think I used 1 tblsp per gallon. Here's a recipe I found on the web

RECIPE: homemade Horticultural Oil spray:KEEP OUT OF REACH OF CHILDREN!
1 tablespoon vegetable cooking oil (corn, soybean, peanut or sunflower) per gallon of water. To increase efficiency, add 1 teaspoon of NON-DEGREASING liquid dishwashing detergent per gallon of water (addition of soap increases the risk of plant injury)

Hope that helps.

Thanks Kat, I'll try it!

Have you tried this oil and soap recipe and did it work?
K_G

KG, yes, I tried it a few times, but no success. However, we've been having severe wet weather, which may have affected the results.