My rose seems to have a tumor. Found it at the root when changing pots. It turns white after washing. Do I need to cut it off?

If there are nodules, they can grow and bloom smoothly, just pick them off.

Nodules exist in various positions and distributions on the root system, which can not stop the growth of other healthy parts, just like a person with two legs, a tumor on his left leg and a normal right leg, and can continue to grow.

Nodules will spread, but the spread bacteria will not cause new infections if they do not meet the conditions (wounds) that can be invaded.

The influence of nodules on plants lies in the competition between nodules and normal parts, and the assimilation ability of each plant is different. If the substances produced by plant assimilation are far greater than those needed for nodule expansion, then plants can continue to grow (only at a much slower rate). If the substances produced by plant assimilation are far less than those needed for nodule expansion, other parts of the plant will stop growing, and all substances of plant assimilation will be swallowed up by nodules.

In this case, you can manage the water and fertilizer normally, because the nodule can't expand indefinitely, it is connected with one another. However, if the plant voluntarily gives up the root through self-regulation, the ultimate destination of this nodule is extinction, just like a person bitten by a snake, the bitten part will break immediately.

It is very noteworthy not to harm other healthy roots of this flower, because nodule infection requires a wound. If you cut healthy roots at this time, healthy roots may be invaded by nodules.