[Study of the antiviral activity of cyclopentene beta,beta'-triketone disodium salt in the leaves of two Nicotiana tabacum L. cultivars infected with tobacco mosaic virus].

The effect of disodium salt of 2-acetyl-4-hydroxycarbonylmethylthio-5-chlorocyclopent-4-en-1,3-dione on development of the infection caused by tobacco mosaic virus in the leaves of two Nicotiana tabacum L. cultivars--an oversensitive cultivar Xanthi-nc and systemically affected Samsun--was studied. The results suggest that this compound interferes with reproduction of the virus. This antiviral displayed the highest activity when applied in a mixture with the virus, presumably due to its action on both the plant and the virus.