My favorite thing to use is sold as food for tropical fish. It is called freeze-dried blood worms. I first rub it through a fine screen, like used to strain tea leaves from brewed tea. I then sprinkle just a little bit onto leaves that appear to have some functionality. Afterwards I lightly spritz to moisten the insect powder, but not wash it completely from the leaves. It is good for a little of it to reach the media and plant roots. In a week or two you should see a positive response. I've heard that others use the insect pieces whole and simply spritz to remoisten them. And they are also available in frozen form, just thaw.