Around 20,000 apple plants and 400 stonefruit plants imported from a US testing facility have been released from all restrictions, says the Ministry for Primary Industries.
The plant material was seized following an MPI audit in March which found a number of significant failures at Clean Plant Centre Northwest. MPI said it had little confidence in the testing carried out. An investigation by US authorities confirmed MPI's findings.
MPI had now completed additional testing for pests and diseases of concern on the affected apple plants as well as a small number of stonefruit plants, said director of plant and pathways, Pete Thomson.
"As all the test results were negative and we are satisfied the biosecurity risk has been minimised, we're pleased to be in the position to release these plants back to their owners.
"Throughout this process, our decisions have been based on protecting New Zealand and our wider horticultural industry. Some of the diseases, if present, could impact significantly on our wider horticultural industry."