"The approval allows a number of trial shipments, which will be carefully monitored for compliance with the agreed export processes."
He said Tonga would need to complete the trial shipments without any non-compliance issues.
"MPI will then fully reopen the pathway and closely monitor it to ensure export processes continue to be undertaken."
Thomson said New Zealand was currently free from fruit fly species that attack commercial fruit.
"If introduced to New Zealand, these fruit flies could have devastating consequences to our horticultural production and trade."
Tonga's Trade Minister, Samiu Vaipulu, told local media work was underway to establish a more organised system to avoid fruit fly larvae being detected in products.
Melon growers affected by the suspension who exported through the government had been paid 50 per cent of their price and the government was looking at paying for produce which was destroyed in New Zealand.
- RNZ