By Frank Brines
ARS Master Consulting Rosarian 

Preventing fungal disease on rose bushes

 

Last updated 11/4/2020 at 11:30am

roses

Village News/Courtesy photo

A good fungicide should be applied at the first sight of a white appearing substance on the leaves of rose bushes.

Experiencing a summer of high temperatures, fires, smoke, ash and Santa Ana winds, residents look forward to having some relief.

The weather has moderated slightly, and along with the change comes cooler nights with more moisture collecting on leaves. This moisture with the daily accumulation of ash and small dust particles provides a great environment for mildew, rust and black spot on roses.

Black spot is the most common and important disease of roses found everywhere roses are grown. The disease does not kill the plant outright but, over time, the loss of leaves can weaken the plant ma...



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