تأثير بعض عوامل المقاومة الإحيائية في مقاومة مرض تعفن بذور و موت نباتات الطماطة المتسبب عن الفطر rhizoctonia solani kühn

Abstract EN

The aim of this experiment was to evaluate the efficiency of Ticoderma harzianum at the two isolates biofungicide (i.e.

AL– Tahaddy and Biocount –T- ) and Aspergillus terrus and Paecilomyces lilacinus on resistance to tomato seed decay and seedling death caused by Rhizoctonia solani .

Antagonism experiment revealed a significant effect of T.

harzianum with its two isolates AL – Tahaddy and Biocount –T- on reduction in the mean of radial growth of fungus , the rate of growth was 3.87 and 3.43 cm.

respectively , these were significantly different with the treatment of P.

lilacinus which not significantly different compared with control treatment that produced mean growth of 9.0 cm.

Result also showed the effect of filtrate of T.

harzianum of its two isolates AL – Tahaddy and Biocount –T- on the rate of radial growth of fungus with a significantly difference of control treatment .

While the two isolates have no significant effects on petridish germinated seeds that were 19.5 and 20.0 seedling of the two isolates , respectively , compared with that of the control treatment ( 18.5 seedling ) .

The two isolates of T.

harzianum produced ( AL-Tahaddy and Biocount –T- ) good protection to seeds and seedling of tomato from the infection of this fungus .

The germination percentages were 60.0 , 70.0 % and seed decay were 40.0 and 30.0 % and plant shoot dry weights of 31.67 and 39.91 g.

respectively .

These values were significantly different compared with control treatment ( with the presence of fungus ) , the values were of 34.2 % for seed germination , of 65.8 % for seed decay and 13.08 g.

for plant shoot dry weight .