Rose breeders are striving to introduce vigorous, disease resistant varieties and it is true to say that most modern bush roses are fairly disease resistant.
Varieties described as disease resistant usually remain clear of disease, however, all roses will be liable for attack when the conditions for the fungus are perfect or where they are growing near an less resistant rose variety.
Another problem is that resistance to disease often deteriorates with time. A good example is the luminous orange hybrid tea “Superstar” (Syn “Tropicana”). When introduced during the 1950s it was resistant to all the common rose diseases, nowadays it is extremely difficult to grow well as it is prone to all the diseases.

Different strains of fungi develop over a number of years and the result is resistance is lost.

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