US EPA exemption for MBI’s bio-molluscicide

The US EPA has invited a tolerance exemption yesterday for residues of Pseudomonas fluorescens strain CL145A in or on all food commodities when applied as a molluscicide. The request was made by Marrone Bio Innovations, Inc. (formerly Marrone Organic Innovations, Inc.) in 2009.

Pseudomonas fluorescens strain CL145A is a naturally occurring bacterial species that was isolated from a river mud sample in the northeastern United States. This isolate is being registered as a biocontrol agent for zebra mussels (Dreissena polymorpha) and quagga mussels (Dreissena bugensis) that infest enclosed and other confined static or flowing water infrastructures (e.g., water storage chambers and tanks, pipes, general plumbing and equipment, and other water conveyance structures associated with civil infrastructure). When a zebra or quagga mussel ingests artificially high densities of Pseudomonas fluorescens strain CL145A, a toxin within this bacterium's cells destroys the digestive system of the mussel.

EPA concludes that there is a reasonable certainty that no harm will result to the U.S. population, including infants and children, from aggregate exposure to residues of Pseudomonas fluorescens strain CL145A. Therefore, an exemption from the requirement of a tolerance is established for residues of Pseudomonas fluorescens strain CL145A in or on all food commodities when applied as a molluscicide.

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