Unwanted microbial invasion and first report of two new diseases encountered during paddy straw mushroom cultivation in odisha

Jyotsna Naik and B.K.Pani

The present study was undertaken to record the incidence of weed fungi during straw mushroom cultivation in Odisha and assess the corresponding yield loss. Incidence of thirteen competitor moulds were recorded, the predominant being Trichoderma sp. (23.87 %), Sclerotium rolfsii (22.97%), Aspergillus flavus(12.44%), and Aspergillus niger (10.57%) Rhizopus sp. (11.48 %), Coprinus lagopus (9.93 %) and Coprinus comatus (9.65 %).These major competitor fungi caused 9.87 to 64.36% reduction in mushroom yield, highest and lowest reductions being caused by Trichoderma sp. and C. comatus, respectively. Few diseases like bacterial button rot (3.21%) and fungal button rot (2.04 %) have also been reported, though not of economic significance, caused 6.54 and 3.84 % reduction in mushroom yield. Primordial malformation or wet bubble disease caused by Mycogone perniciosa and Cobweb infection caused by Cladobotryum dendroides were found for the first time on straw mushroom from Odisha or elsewhere in India. Diseases/disorders viz. violet ooze inside bed and tiny pinkish balls in beds were very rarely observed, but the etiology could not be established.

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