The law states that the grower must have a copy of the section 18 label in his or her possession at the time of application. Although I have seen no data for efficacy of Ferbam for orange rust control, it should provide good control. One problem with Ferbam is that it has a 40-day preharvest interval. Thus, Ferbam will not be useful for early season control of orange rust. In relation to orange rust control, it is extremely important to remember that cultural practices will always be critical for successful control.
Wild brambles serve as a reservoir for the diseases.
For orange rust, it is particularly important to inspect the planting early in the growing season. They are easy to identify in the spring. If these pustules are allowed to develop, they will produce large numbers of aeciospores, which will spread the disease. If infected plants are not removed early in the spring, they become more difficult to identify later in the growing season. In order to successfully control orange rust with the use of fungicides, they will always need to be used in conjunction with the cultural practices mentioned above.