Howdy Jonny, I have had a few plants develop root rot and have not noticed any effect to the taste of the bud. The rot was cured before the harvest took place, but still did not notice any problem with the bud. If the root rot is not cured (and prevented from reoccurring) the quantity and sixe of the buds will be adversely affected since the plant will be putting more energy into surviving and not producing extra buds.