Two of the 11 workers were taken into custody for deportation, eight were issued warnings and one issued a notice making him liable for deportation.
Labour Inspectorate Regional Manager Kevin Finnegan said: "This is a very disappointing outcome and shows growers are failing due diligence on the contractors they use for labour.
"This is a stark reminder to contractors to ensure that all their workers are legally able to work and, if they're from overseas, that they have their right visas," Immigration New Zealand's General Manager, Verification and Compliance, Stephen Vaughan, said.
In Pukekohe a number of contractors operating on the Fresh Grower Ltd and Hira Bhana & Co Ltd farms had no employment agreements for their employers and were allegedly paying them no more than $14.50 an hour in cash
One contractor had migrant employees working illegally on visitor's visas.
"This is a poor result, considering the inspectorate has been working extensively with the horticulture sector to assist them with getting their employment practices on an assured and legal footing," Finnegan said.
Enforcement action against the employers is still being finalised.
MBIE is also leading a review to reduce the exploitation of temporary migrant workers.