PJB-2017-883
HERBICIDES EFFECTIVENESS AGAINST ROOT ROT FUNGI AND GROWTH OF CROP PLANTS
Shahnaz Dawar
Abstract
Herbicides such as bromacil and bromoxynil were used to study the activity against root infecting pathogens namely; Macrophomina phaseolina, Rhizoctonia solani and Fusarium spp. Herbicides were purchased from Agrochemical market of Karachi and applied as soil drenching (0.1, 1.0 and 2% v/v concentration) in pots and observe its effect on growth of cowpea and mung bean plants. Both herbicides gave tremendous effect on tested crops growth in contrast to control. Highest shoot and root weight of mung bean and cowpea were recorded when 2% (v/v) concentration of bromoxynil was used. Maximum suppression in colonization of root infecting fungi was recorded at 2% (v/v) concentration by both herbicides followed by 1.0 and 0.1% (v/v) concentrations. Out of all three concentrations tested, soil drenching with 2% (v/v) by both herbicides showed excellent results which was selected for the field experiment. In field experiment, shoot length and weight were increased and also showed a greater number of nodules in mung bean and cowpea plants as compared to control. It was interesting to note that the weeds were found on the control plants, while it showed complete suppression in the treated plots with both herbicides. Fusarium spp., R. solani and M. phaseolina colonization were significantly reduced when soil was drenched with bromacil followed by bromoxynil herbicide.
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