CONTAMINANTS AND YIELD OF DIFFERENT STRAINS OF MAPLE OYSTER MUSHROOM (Pleurotus cystidiosus) IN SELECTED SUBSTRATES

Abstract

The experiment was carried out at the mushroom culture house of Mushroom Development Institute, Saver, Dhaka and central laboratory of SAU during the period from October 2019 to March 2020. The experiment was conducted to compare different strains of maple oyster mushroom on contaminants, growth and yield contributing characters. Seven strains of Pleurotus cystidiosus, viz. Pcys-1, Pcys-2, Pcys-3, Pcys-4, Pcys-5, Pcys-6 and Pcys-7 and three different substrates S 1 (Saw dust), S 2 (Rice straw), S (Saw dust + Rice straw) were used in this experiment. The experiment was laid out in Completely Randomized Design (CRD) with four replications. Trichoderma sp, Alternaria sp and Aspergillus niger were identified as contaminants, where green mold was detected as the major one. The highest contamination incidence (100%) was observed in S 1 P 6 , S 1 P 7 and S 3 P 2 3 , whereas the lowest incidence (60%) was recorded from S 1 P . The lowest days (7 days) required for mycelium running on spawn was found in S 1 1 P 1 , S 1 P 2 , S 1 P 3 , S 1 P 4 and S 1 P . No mycelium running was observed in Pcys-6 and Pcys-7. The highest biological yield (98.50 g), economic yield (95.75 g) and biological efficiency (53.25%) was found from S 2 P 1 5 , whereas the lowest biological yield (65.25g) was found from S . The highest diameter (7.13 cm) of pileus was recorded from S 3 P whereas the lowest diameter (4.13 cm) of pileus was found in S 1 P . Rice straw showed better performance followed by saw dust and combination of the both rice straw and saw dust during cultivation. 2 Key words: Pcys, Substrate, Biological yield, Economic yield, Biological Efficiency