rtokens: Mexican officials contend that there is no scientific basis for the ban , and that it is illegal under international trading rules of the World Trade Organisation .
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tokens: California growers have charged that removing the restrictions , even on a limited basis , would endanger the $ 1 billion U.S. industry if potentially harmful Mexican insects were brought into the country along with the avocados .
ltokens: The plan has raised a storm of protest from U.S. avocado growers , who are largely concentrated in California .