Off the top of my head: Bt proteins, copper. There are many more, you can easily google and find a long list. And yes, that's the same Bt that's in Bt crops, b

Off the top of my head: Bt proteins, copper. There are many more, you can easily google and find a long list. And yes, that's the same Bt that's in Bt crops, by the way (proteins from Bt bacteria). Organic farmers use it in a spray. It's a natural substance, and they argue the spray causes less resistance than the GM varieties. I really don't have the domain knowledge to say whether they're right. Not all organic farmers are the same, and over time the meaning of 'organic' has been diluted. Smaller, more idealistic organic farmers mostly don't use pesticides, but there are large commercial organic growers out there who meet the bare minimum for certification and will use whatever pesticides are allowed.