Kauai Mayor Bernard Carvalho Jr. Thursday vetoed a bill that would require large agribusinesses to disclose the type of pesticides they spray on fields and implement buffer zones around schools, dwellings and medical facilities. Those businesses that purchase or use more than five pounds or 15 gallons of restricted use pesticides each year must disclose all types of pesticides they spray on their fields.  Carvalho said he agrees with the intent of this bill to provide for pesticide use disclosure, create meaningful buffer zones and conduct a study on the health and environmental issues relating to pesticide use on Kaua'i, but he believes strongly that this bill is legally flawed.