Of all the tested fungi, A.
alternata was highly sensitive to the most of the isolates
used in preliminary screening using a cross plug assay
(Figures 1 and 2). Aerial mycelium was white, light grey
white to dark grey white for most of the potent strains
while the colour of the substrate mycelium appeared
brown to light cream yellow (Table 1). Rizk et al. (2007)
reported grey and white colour series of actinomycetes
as the dominant forms in the soil as compared to yellow,
red, violet and green ones. Different colour series of
actinomycetes were recorded in soil (Ndonde and Semu,
2000).