Abstract
Leaves of rice plants grown in the ceramic and brick industry areas of Taiwan were reported as showing acute symptoms of tip necrosis and chronic symptoms of yellowing and mottling. The ambient fluoride concentration in the ceramic industry area ranged from 0·4 to 15 μg kg −1 with an average of 4·5 μg kg −1 in May and June 1983. Fluoride concentration in rice leaves increased with increasing severity of the injury. There was an 80-fold difference in fluoride concentration between healthy and severely injured leaves. Fumigation of rice seedlings with HF induced symptoms on leaves similar to those occurring in nature. Results suggest that fluoride emitted from the ceramic and brick factories causes the new rice disease.
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