Dry rots are more difficult to eradicate and although they cannot survive in dry conditions, treatment also often involves the removal of all infected material and the use of chemicals.
Mae'n anos dileu sych-bydredd ac er na all oroesi mewn amgylchiadau sych, mae'r broses o'i drin yn aml yn cynnwys cael gwared ag unrhyw ddeunydd heintiedig a defnyddio cemegion.