Efficiency of Some Herbicides and Fungicides on Management of Common Bean Damping-off and Root-rot Diseases
Rodina Ahmed Hassan
Economic Entomology and Pesticides Department, Faculty of Agriculture, Cairo University, Egypt.
Hala A. M. Eldakar *
Plant Pathology Research Institute, Agriculture Research Centre, Egypt.
*Author to whom correspondence should be addressed.
Abstract
The three tested herbicides and fungicides caused significant inhibitory effect on the growth of Fusarium solani and Rhizoctonia solani the causal of common bean damping-off and root-rot diseases compared with control treatment. This inhibition was gradually increased by increasing the concentration of the tested herbicides and fungicides. Moreover, the fungus F. solani was greatly affected by the tested herbicides and fungicides than the fungus R. solani. Furthermore, the tested fungicides were more efficient than the herbicides in this regard. There was significant decrease in both damping-off and root-rot severity with significant increase in the survived plants due to the treatment with the tested herbicides and fungicides. No damping-off and root-rot were recorded in case the tested herbicides, fungicides and non-infested soil. Highest percentages of damping-off, root-rot and lowest survived plant were recorded in case of soil infested with any of the two pathogens. In addition, the combination between the tested herbicides and fungicides with any of the tested pathogens resulted in significant reduction to damping-off and root-rot severity with significant increase in the survived plants compared to plants grown in soil infested with any of the two tested pathogens and did not receive such a treatment. The treatment with any of the tested herbicides and fungicides and grown in soil infested with any of the two pathogens resulted in remarkable increase in the total phenolic compounds compared to the values of plants grown in soil infested with any of the two causal fungi (control plants). Gradual increase in the values of total phenolic compounds was occurred by increasing the time of inoculation with the pathogens and the highest increase in the total phenolic compounds was occurred by the tested fungicides compared with the tested herbicides. The percentages of the estimated nitrogen and protein content in common bean green seeds were increased due to the treatment with the tested herbicides and fungicides compared with the green seeds of plants grown in soil infested with any of both pathogens. The tested fungicides caused considerable increase in the percentages of total nitrogen and protein when compared to the tested herbicides.
Keywords: Common bean, crop yield, phenolic compounds, total nitrogen, protein