Just one's ability to predict the right timing to get the crawlers, but it is inexpensive, mixes easily and works great, super low impact on non target species. I use it on tree fruit.

Got it just in time to ride my tomatoes of those nasty green horned worms. Seems to work. Will try it on some other small green worms that want to devour my parsley.

I recently placed an order from Seven Sptings and the service was wonderful. The order was correct and the shipping time was very quick.
I will be placing orders in the future.