Is Acidithiobacillus thioxidans allowed in USDA organic crop production?

Is Acidithiobacillus thioxidans on the organic National List? No.

What this means

Acidithiobacillus thioxidans isn't on the National List under any name we hold for it. The list names the synthetic substances allowed in organic crop production and the nonsynthetic ones prohibited. A nonsynthetic substance is allowed unless 205.602 prohibits it, and most microbial inputs are nonsynthetic.

What it means for US registration

Organic use still depends on the whole product: how it's grown, how it's formulated and what else is in it. An organic claim on a label usually needs the product reviewed by OMRI, a certifier or the state's organic program.