The spawn run period, time for first appearance of mushrooms, number of flushes and biological efficiency (yield) of eight different strains of oyster mushrooms grown on composted sawdust of Triplochiton scleroxylon
K (Schum) were studied. The spawn run period on the compost bags for the strains ranged from 40-48 days. Plewotus citrinopileatus
strain PCB showed very poor and patchy growth and the mycelium never fully colonised the substrate. This indicates that the different strains of the mushrooms utilize the given substrate at different rates. The time for first appearance of mushrooms ranged from 4 to 35 days. With the exception of P. burundii
strain HK-51, which produced only one flush, all strains produced at least three flushes. Pleurotus eous
strain Kapak, the highest yielding strain produced six flushes. With all the strains flush 1 gave the highest yield of 63.9g, and flush 6 the lowest yield of 0.9g. Pleurotus eous
strain Kapak gave the best yield and biological efficiency whilst P. burundii
strain HK-51 produced the least yield. P. citrinopileatus
strain PCB did not produce any fruiting bodies during the period of study. Significant differences (P<0.05) in yield of the different species of mushrooms were recorded.