You are assuming that nothing it remaining on the leaves because you can't see it. I have never found that to be the case when using Thuricide. Rather that run off is an indication that you are applying too much. A fine mist is all that is needed. It is quite effective as is.

Sure one can use stickers but they often interfere with the products effectiveness.

Dave

ynot, you can buy commercial spreader/stickers very inexpensively. They actually work to make your active ingredient more effective and last longer. Use the term spreader sticker to find the products....there are several brands; I believe that I have Hi-Yield in my cupboard.

I do find it a little odd that BT sprays don't include some kind of surfactant. It would be real cheap and make them stick better. You'd think it would make them work better. A big marketing advantage. Have to wonder if general purpose surfactants do indeed interfere with their effectiveness, and that's why they are not included.

I should point out that according to the SDS at least Hi-Yield surfactant is mostly polyethylene glycol, which you might as well get from many dish soaps, if not laxatives.

Use the commercial product. It's formulated for the job and without the other stuff that is added to dish detergent.

Well, we are just talking about a couple of drops of dishwashing detergent per gallon. I use it regularly, and it works fine.

Dawn works fine and doesn't interfere with the effectiveness of BT for me. I used to use spreader sticker but ran out a couple years ago and have just used Dawn since then and haven't noticed a difference. I wouldn't mix up more than I was going to use in one application though. I have about 40 brassicas going now and also use it on my lettuce because sometimes the cabbage butterflies lay eggs on them too and to keep the carrot worms at bay on my patch of those.

i use baby shampoo instead of dish detrgent seems to work, bur with thurcide i mix nothing a fine mist works great. if other bugs apear i use a very small amout of neem oil (naturally processed mail ordered) and a few spoons of either dawn or johnsons baby shampoo may be two table spoons of each in a little more than 1/2 gallon of water.