استخدام أنواع من الجنس Trichoderma كمعاملة للبذور لمقاومة مرض سقوط البادرات Rhizoctonia solani Kuhn على نبات الطماطة

الملخص EN

An experiment carried out to test the efficacy of biological control by cover of tomato seeds with fungal T.

virens, T.

hamatum and ..

harzianum T and T.

viride and test their ability against damping-off diseases on tomato seedling R.

solani.

Tests in media culture showed that all species of Trichoderma when they exist with R.

solani in Dual culture ( PDA ) had a significant effect in inhibiting the growth of R.

solani compared with the treatment comparison, the most influential T.harzianum at 48 hours ( 55.55% ) As at 72 hours was ( 66.66% ), the least inhibition T.hamatum + R.

solani.

At 48 hours ( 50.33% ) either at 72 hours was ( 33.22% ), Observed also that all species of Trichoderma did not lead to increase the germination percentage of seeds ( in absence of pathogen ) and was the most influential T.harzianum where the germination percentage of seeds 78.9 % compared with the treatment comparison, 87% and the least T.hamatum where germination percentage of 78.3%.

The results also show that the addition of all species of Trichoderma spp.

was useful in reducing the incidence of pathogenic fungi Rhizoctonia solani.

Where it was noted that the cover of all seeds by species of Trichoderma spp.

Had a significant impact in increasing the germination of seeds ( with pathogen ), especially T.

harzianum which led to the germination percentage increased to 85.5% compared with the treatment comparison of 50%.

As well as the add of all species of Trichoderma spp.

was useful in reducing the incidence of pathogenic fungi Rhizoctonia solani.

was most influential T.

harzianum where total plant height 51.4 cm and weight of shoot fresh 78.46 g, dry 5.7 g and weight of the total root fresh 6.61 g, dry 5.7 g compared with the treatment of comparing in presence of the pathogen fungi was respectively 35.5 cm, 57.69 g, 3.00 g, 4.00 gm, 0.22 gm.