No, there are organic pesticides. Some on them can be better (e.g. less stable) than some synthetic ones, that's all. And them being organic also guarantees that they can't be improved, in terms of stability or targeting, so that is entirely stupid.
Please explain this part.
I was under the impression that certifications for "organic" labeling was a threshold thing and nothing prevents one brand from trying to be more efficient within limitations compared to another brand, as long as it is below or above certain levels.
* intended by organizers, not spelled in the text.
Synthetic pesticides are designed and screened in the same way as small molecule drugs, a long and uncertain process that's still far easier than discovering a new natural product. At least in theory, these synthetic compounds can be optimized for whatever we want. It's just that absent regulation, the commercial incentive is for better short-term yield regardless of the ecological cost.
One could imagine a certification similar to organic that forbids the most ecologically damaging practices--even if they're using natural products--and permits safer use of synthetic products. Probably a hard sell to consumers, though. I've occasionally seen produce marketed as "IPM" (integrated pest management), which isn't quite that but goes in that general direction.