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.