تقويم كفاءة بعض الفطريات الممرضة للدنان في مكافحته باستعمال استراتيجية المسبب المتعدد

Abstract EN

This study had been conducted to evaluate the efficacy of the isolated fungi on Echinochloa crus-galli (L.) Beauv.

individually or in combination by using multiple pathogen strategy under glass house and field conditions.

Test of spraying Barnyard grass 21 days old with spore suspension of pathogenic fungi isolates individually or incompination under glasshouse condition showed that all the treatments gave significant increase in disease severity as compared with the control treatment which was not treated with pathogenic fungi, with the superior of the treatment of mixture of the isolates AA5+ CT4 + DA6 + DM6 over the treatments of these fungi individually.

The disease severity in the mixture treatment was 97 %.

Results of soil treatment with spores suspension of pathogenic fungi isolates were showed the mixture of the isolates CD3 + FO3 + FSe6 gave highest effect in percentage of seed germination and disease severity 12.5% and 78.2 % individually, Field condition experiment showed highest effect on the disease severity to the mixture of isolates AA5 + CT4 + DA6 + DM6 on both weeds Barnyardgrass and Watergrass which are the most distributions in rice fields when compared with the treatment by single fungus and the disease severity was 80.8 % on Barnyardgrass and 71.6 % on Watergrass.

The results showed that all treatments on rice plants have no significant reduction in the disease severity as compared with the control treatment which was not treated with pathogenic fungi.