تأثير التداخل بين العامل الأحيائي Trichoderma harzianum و المبيد الفطري Moncut في مرض الرقعة العارية على الحنطة المتسبب عن الفطر Rhizoctonia solani في شمال البصرة

الملخص EN

This study was carried out to investigate the interaction between bioagent Trichoderma harzianum and fungicide Moncut on wheat bare patch disease which study for the first time in Iraq caused by Rhizoctonia solani.

The results revealed that Rhizoctonia solani was the causal pathogen of wheat bare patch disease.

The laboratory experiments showed that Moncut had inhibition effect on the growth of this fungus, when reached to 50.55 and 42.22% for R1 and R2 isolates respectively, and to 7.33% for bioagent T.

harzianum .

On the other hand the concentrations of 150 and 200 ppm of Moncut fungicide were revealed high inhibition effect among all concentrations used against R1 and R2 isolates on PDA, which reached 62.2, 66.3, 75.7 and 80.9% respectively.

Field experiment results revealed that the treatment T+M+R1 and T+M+R2 led to increase seed germination percentage and reduced seed decay percentage to 89.67, 10.33, 82.0 and 12.0% respectively compared to 50, 45.33, 50 and 54.67% respectively for treatments R1 and R2 alone.

It's also observed that T+M+R1 and T+M+R2 increased offshoot number , plant height , fresh and dry weight for both shoots and root systemwhich reached 7.2, 6.6, 59.66, 55.89, 25.16, 22.56, 2.76, 2.42, 6.49, 6.37, 0.59, 0.66 respectively in comparison with the treatments of R1 and R2 alone which were 4.4, 4.1,41, 38.33, 10.86, 9.51, 1.28, 1.02, 2.67, 2.55, 0.29,0.23 respectively.