As long as you treat the cause, the effects will disappear. If the disease is persistent after following the below steps then proceed on to the organic disease control section. Always key into Nutrition First. For as in humans so it is with plants. Always Seek Balance, When things are out of balance, Infestation and Disease occurs.
Balance is as important to the soil and plants as it is to humans.
When things are in balance, stress is reduced and all things function accordingly. The Good Guys and the Bad Guys don't live in the same place. Bad bacteria and good bacteria do not share the same soil. Dead soil is not actually dead but instead contains the presence of bad bacteria or fungi or any number of disease sources. Avoid High Nitrogen Fertilizers.