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The method of inhibiting a plant virus using gold nanoparticles is a method of inducing plant resistance against viral disease caused by Barley Yellow Mosaic Virus (BYMV) particles by introducing a therapeutically effective amount of polydispersed goldnanoparticles to the plant through a mechanical abrasive, wherein the average effective diameter of the nanoparticles is between about 0.5 nm and 200 nm and wherein the gold nanoparticles are present at a concentration of about 1.0. times. 10. sup.-5 g/ml to about 6. times. 10. sup.-4 g/ml, and wherein the gold nanoparticles melt and dissolve the virus particles.