They're fighting the use of methyl iodide.
In November, state pesticide regulators approved the fumigant for use by fruit and vegetable growers. A lawsuit announced Monday alleges state regulators did not sufficiently evaluate the pesticide's risk and approval was based on insufficient data.
Regulators insist the chemical can be used safely and say strict guidelines will be followed. Tests have found no traces of the carcinogen in fruit from treated soil.
The methyl iodide is already registered in 47 other states.
