Dunedin landowner blocks Ospri possum control work 12 Apr, 2021 11:30 PM 4 minutes to read Possum control work blocked. Video / ODT Otago Daily Times By: Molly Houseman A Dunedin landowner has blocked Ospri staff from carrying out possum control on his land, claiming the company is harassing him and being "a nuisance". But the pest control company says it is allowed on the property and the work is critical to ensure a tuberculosis (Tb) outbreak is prevented in the area. Police were called to Adrian Black's Sawyers Bay property about 9.30am after Ospri staff were confronted by Black and about 20 others who also opposed Ospri's work.