Tomatoes New Zealand chairman Alasdair MacLeod said food and hospitality retailers needed to understand the responsibility they now had to their customers.
"They must work to clearly label their irradiated produce at point of sale and on their menus.''
Unlike Australia, New Zealand did not have compulsory labelling of fresh produce - so unless retailers clearly labelled irradiated Australian tomatoes and capsicums, consumers wouldn't be able to distinguish irradiated tomatoes from New Zealand tomatoes which are never irradiated, he said.
"We acknowledge irradiation is a vital tool to protect New Zealand's vulnerable horticulture industry from fruit fly, and we support its use on at-risk produce.
"However, we do want consumers to have information at point of sale so they can make an informed decision whether to eat irradiated tomatoes ...''
Last month New Zealand Health Import Standards were amended by the Ministry for Primary Industries - permitting Australian irradiated tomatoes to be imported and sold to food and hospitality sectors here.
Tomatoes New Zealand had been working with the Ministry and Food Safety Minister Nikki Kaye to ensure the legal labelling requirements for retailers and processors was strongly enforced and monitored.
"We are pleased that the Ministry has plans to inform sellers of the labelling requirements and will work to monitor and penalise retailers if they refuse to comply with the code,'' Mr MacLeod said.