Antibacterial activity of green silver nanoparticles on the in vitro pathogen infected Eucalyptus pellita plant by Sawalha, Hanadi, Ahmad, Siti Aqlima, Shaharuddin, Noor Azmi, Sanusi, Ruzana, Azzeme, Azzreena Mohamad, Naganthran, Ashwini, De Silva, Catrenar, Abiri, Rambod