Isolates were also screened for the productions of hydrogen
cyanide (HCN) using NGA-plate amended with 4.4 g L1 glycine
following the method described in Lorck (1948). A Whatman filter
paper No.1 soaked in 2% sodium carbonate in 0.5% picric acid solution
was placed at the top of the plate. Plates were sealed with
Parafilm and incubated at 28 C for four days. Development of orange
to red color indicated HCN production.