Pathogen-plant interaction, effect herbicides

Several types of interactions are possible when a herbicide is introduced into the plant environment. In addition to the desired effects of the herbicide on weeds, growth alteration of crop plants may occur. It follows then that any pesticide, applied to plants or soils to control a specific pest, may also affect nontarget soil microorganisms and plants. Therefore the phenomenon of disease increase due to herbicides is not restricted to a specific group of herbicides, pathogens, or crops. 

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