Ms Adams suggested councils were straying from national policies on GMOs and has asked officials to review attempts by councils to establish regionally-specific rules for GMOs.
Pure Hawke's Bay said the region's GM Free status was vital for generating greater wealth from food exports. The region should have the ability to decide whether to retain the status.
Apple grower John Bostock said the GM Free status was crucial when it came to marketing export food products.
He said producers had no certainty under the Hazardous Substances and New Organisms Act that the region could retain its GM Free status.
"Hawke's Bay fields are GM-free now but that could change should the EPA give the go ahead for GM crops to be planted here. Councils' ability to rule GM releases under the Resource Management Act is key to ensuring Hawke's Bay can remain GM free in the field."
Hastings mayor Lawrence Yule said the government was trying to achieve a consistent approach to GMOs nationally but it would also prevent districts and regions determine their own way to deal with the issue.