National MP Sarah Dowie says Marama Davidson has undermined fellow Green Party MP and Conservation Minister Eugenie Sage with comments over 1080.
Ms Davidson said on Wednesday protesters who threw dead birds and fake pellets on the steps of parliament had "valid concerns".
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"We need to listen, and we need to have community-led conversations about this," she told Stuff.
"They are trying to be heard, and we will need to keep listening."
"There are some concerns about 1080 but it is the major tool we've got in the tool box to assist particularly in the more remote and mountainous areas," Ms Sage told Stuff in June.
Ms Dowie said it was not a good look for the Greens to have two MPs apparently disagreeing about the poison.
"Ms Sage will be highly embarrassed by Marama Davidson's comments to the anti-1080 lobby," she said.
"She's basically undermined Ms Sage's efforts with respect to the protection of our biodiversity."
Ms Dowie said the division may go even further, considering another governing party's stance on the poison.
"New Zealand First actually campaigned on banning the use of 1080," she said.
Both National and Labour say 1080 is the most effective pest control tool New Zealand has. They have the support of the Parliamentary Commissioner for the Environment, the Department of Conservation, the Environmental Protection Authority, and lobby groups including Forest and Bird, Federated Farmers, WWF and Ospri.