**2.4 Antiviral activity of** *Boerhavia diffusa*

Against potato virus X, *Boerhavia diffusa* have shown a very good effect in inhibiting in hypersensitive and systemic hosts. The inhibition of these extracts was found to be very sensitive to actinomycin D. By the application of the aqueous root extract of *B. diffusa*, the destructive yellow mosaic disease of mung bean [*Vigna radiata*], caused by mung bean yellow mosaic virus was controlled. The treatment also resulted in increased plant height, root nodulation, primary and secondary branches, grain yield and pod formation. Against bacteriophage, the purified form of glycoprotein obtained from *Boerhavia diffusa* showed strong antimicrobial activity. To resist viral infection in many susceptible crops, the extracts obtained from the roots of *B. diffusa* was used. This antiviral agent was active against *Nicotiana tabacum*, Sunhemp and *Crotalaria juncea* [13].
