Detection of fungi contaminated of Pleurotus Ostreatus (Jacq. Fr.) compost and their control

Detection of fungi contaminated of Pleurotus Ostreatus (Jacq. Fr.) compost and their control


Hurria H. Al-Juboory, Kamil S. Juber, Ayad W.A. AL – Juboori 
College of Agriculture, Univ. of Baghdad 

Abstract

This research was conducted to detect the fungi contaminated the spawn of Pleurotus Ostreatus  and their  control. The  results showed that P. ostreatus compost was contaminated with Trichoderma harzianum and Doromyces sp.at 80% and 20% respectively on culture media PSA and considered as first record of green mold  causal agent in Pleurotus ostreatus  culture in Iraq . The fungicides Beltanol and Pavistin showed high efficacity in  inhibition of T. harzianum  growth which attained to 100 % and 92.2 % respectively on culture media PDA  but exerted on inhibition of 100% and 22.3 % to Oyster mushroom growth respectively .Results of laboratory experiment  showed the high efficiency of water extract of Eucalyptus (Eucalyptus spp.) leaves  at concentration 40% and 100% in  inhibition of  T. harzianum  growth which attained to 100 % and 93.5 % respectively howevere  no inhibition effect of water extract of Basil( Ocimum basilicum ) and Allium oil on T. harzianum growth the inhibition percentage was found to be Zero % for each . Injection results of bags, containing Oyster mushroom and  contaminated  with T. harzianum in water extract of Eucalyptus at incubation room showed concentration 100 % and 40 % activities on increase in yield fresh weight 485.0 g and 406.0 g / kg culture medium respectively compared with 181.0 g/ kg in control (infected with T. harzianum). The concentration 100% caused an increasing in dry weight reached to 63.0 g compared with 22.4 g in control with biological activity 48.13 % compared with 18.1% in control.