تقييم كفاءة الفطر الإحيائي Trichoderma harzianum و بعض المستخلصات النباتية في مقاومة الفطر Alternaria alternata المسبب لتبقع أوراق نخيل التمر

Abstract EN

This study was to test different techniques for the efficiency of the bioagent fungus Trichoderma harzianum and some plant extracts against Alternaria Alternata the causal agent of date palm leaf spot .

The study showed that T.harzianum was revealed high antagonism against A.

alternata in adegree of 1.3 under the laboratory conditions.

The results of the chemical detection of the leaves of the plant (henna, seder and olives) were positive result of the active substances of the soap, tannins and phenols ,The results showed that T.harzianum and plant leaves extracts of Henna, Sidr, Olives have a high inhibition against the growth of pathogen A.alternata , The results also showed that the alcohol extract was superior to the water extract with the inhibitory capacity, according to different plant extracts and different concentration.

The highest percentage of inhibition of the seder extract was recorded at 20% concentration (96.26 and 89.33%) for the alcohol and water extract respectively, while the lowest percentage of inhibitory was obtained in the extract of olive leaves at the concentration of 20% which was (74.44 and 70.31)% for the extract of alcohol and water extracts, respectively