The use of aspergillus niger to resist the disease of seed rot and damping off cucumber caused by rhizoctonia solani and some parameters of plant growth

الملخص EN

The study was conducted to control the disease of seed rot and damping off cucumber caused by Rhizoctonia solani using Aspergillus niger, The results of the pathogenicity capacity test of fungi (R.

solani) on the seeds of cucumber plant that the fungus negatively affected the germination of seeds, the germination percentage reached of 00.00%, while the fungi (A.niger) has worked to raise germination rate by 100.00% compared to the control treatment, which reached to 73.33%.

A.niger fungus showed a high resistance against R.solani with rate of inhibition reached 91.58%.

The effect of A.niger was found in some growth characteristics of cucumber plant on percentage of germination, stem diameter, Dry weight of leaves, leaf content of growth hormone Cytokinin (CKS), leaf content of phosphorus and Peroxidase with the presence or absence of pathogenic fungus (Rhizoctonia solani), these traits were found to have increased significantly which reached of (73.70, 7.8 mm, 1.97 mg, 2.98 mg / kg wet weight, 0.037 mg / kg dry weight, 0.14 units / micromole) respectively, compared with the lowest rates of control (40.00 mm, 5.2 mm and 0.65 mg, 1.19 mg / kg wet weight and, 0.009 mg.g-1 dry weight, 0.04 unit /micromol), respectively.