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The accuracy of host range testing in weed biocontrol programmes using plant pathogens has been questioned prompting a research programme into the field safety record of pathogens used for weed biocontrol in New Zealand. Nationwide disease surveys were conducted from 2000-2009, and focused on species closely related to target weeds and therefore potentially most at risk of attack. These surveys identified pathogens associated with any disease symptoms observed on non-target hosts. Disease damage attributable to biocontrol agents was observed on two non-target plants. Pustules of the blackberry rust, Phragmidium violaceum, were found on the endemic Rubus species, R. cissoides (bush lawyer, tataramoa) at one location. This result was predicted from host range safety tests conducted prior to its arrival in New Zealand. No non-target damage was observed in the remaining case studies, confirming to date that all biocontrol pathogens are highly host specific to their target weeds.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Safety in New Zealand weed biocontrol a nationwide pathogen survey for impacts on nontarget plants