Problem with bacterial insecticides is that they are not 100% of what they say is on the label. There is a constant variability in bacterial "species" that cannot be controlled even in the laboratory found in these products. What your getting then under the same label will not be the same from batch to batch. Nematodes being more definitive and intelligent are 100% what they are labeled. They are very effective, easily as and more reliable than bacteria. Your bacteria toxins can be mitigated by the endemic bacteria of the insect, which is based from one generation to the next in the insect egg, this is evolutionary adaption. Nematodes are far more destructive because they cause two kinds of primary damage. One is by their initial entry into the insect and then their regurgitation of their endemic bacteria that reduces the internal structures of the insects and the subsequent mating and production of more nematodes feeding within the insect finalizes their fate. More nematodes will be released than you have introduce by many many fold. It is a domino effect.
