The fungicide is used to control plant diseases in cereals and fruits, including citrus.
"As soon as you bring in a new fungicide, they develop resistance, " Dr Frison said.
Coca-Cola in December told the FDA it found the fungicide in its own and competitors' products.
After years of playing the game that "puts the fun in fungicide" they should be very tough.
The EPA has long regulated field tests and the commercial use of pesticides under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA).
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Zinc is also important for die-casting, galvanizing and rubber making and can be used as a paint pigment, wood preservative and agricultural fungicide.
The FDA expects new test results for the fungicide from imported orange juice shipments as early as Friday afternoon, agency spokeswoman Siobhan DeLancey said.
And with treating bats with fungicide or a mass cull an impossibility because of the sheer numbers involved, a solution is a long way off.
The fungicide was used by Brazilian farmers in the 2011 crop.
The FDA initially didn't say which company reported finding the fungicide, but Coke stepped forward to identify itself Wednesday after PepsiCo said it hadn't contacted the agency.
Regulations on the use of biocides were first introduced in 1998, however a loophole that exempted treated products - such as furniture sprayed with fungicide - will be closed.
The company reassured consumers Thursday that its products are safe, citing a U.S. government assessment that found the fungicide was at levels the government says don't pose a safety concern.
It also pleaded guilty in Missouri for violating the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) by improperly handling pesticides that had been returned by customers, the Justice Department said in a statement.
The representative declined to comment on whether the company has found the fungicide in its Tropicana or Dole juice products, despite the fact that the Brazilian producers asserted that virtually all juice exported to the U.S. contains the substance.
In recent days, rumors spread on social networks and media sites on line saying that Coca-Cola China admitted in a TV program called Topics in Focus on the China Central Television network that its orange juice products contain a fungicide called Carbendazim.
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