Problem with roses

I planted out some miniature roses a few weeks ago and they were coming along well. However, this week they seem to have some fungus on the flower heads and they are turning into dust. Is this a fungal disease and if so whats the best cure?

 

Hi,

Think it might be Rose Balling, where the weather conditions stop the buds from opening , so they then die off and fungus natuarally sets in.

Just cut the affected buds and its stem off and the rest should be ok.

The one just above the bottom fungus affected one, also look like its failed to open.
Try just easing off those brown outer petals,it may just open up in front of your eyes.

 

Thank you Ricky that certainly looks like the problem I have.