The Kauai County Council will meet Thursday to consider overriding Mayor Bernard Carvalho Jr.’s veto of Bill 2491, which creates disclosure requirements for large-scale pesticide use and the farming of genetically modified crops and establishes other restrictions.

The bill will become a county ordinance if five of the Council’s six members vote to override. (The departure of Councilwoman Nadine Naka­mura to become managing director on Nov. 1 leaves a vacancy on the seven-member Council.)

Citing legal concerns, Carvalho vetoed the measure Oct. 31. In a letter to the Council, he said that state and federal governance pre-empts the county from enacting laws to regulate pesticides and genetically modified crops.

His decision outraged bill supporters who say the measure is needed to protect human health and the environment from pesticide exposure, and to more closely monitor genetically modified organisms.

The Council has 30 days to accept the veto or override it.

Bill 2491 requires large agribusinesses on Kauai to disclose the types of pesticides they spray on fields. It also calls for buffer zones barring spraying near schools, dwellings, medical facilities, public roadways and waterways.