If the germ tube has already penetrated the leaf or fruit, these materials will not stop infection. In contrast, an eradicant fungicide can be applied to infected surfaces after the infection has occurred and will stop the infection process. This property of certain fungicides is quite useful, as the grower may apply the fungicide a short time after the beginning of a rain period and still prevent infection. Rubigan and Nova will control scab up to 96 hours after infection has occurred, but they have few protectant properties. Funginex will control scab for up to 76 hours after infection.
Some fungicides have combined eradicant-protectant properties.
Examples are Benlate, Topsin-M, and captan. Syllit, Benlate, Topsin-M, Rubigan, and Nova, when sprayed on existing scab lesions, will reduce spore production in the lesion, a property of great assistance to the fruit grower.