Scale on Roses

Scale on Roses

I have 3 roses with bad scale, I have tried every remedy I can think of including natural. What can I use to eliminate this? It has not spread to others, yet. Is moving them the best idea?

The best time to control scale on roses is during winter, using repeated applications of horticultural oil at the winter rate to smother the insects.

Treat scale in winter

Scale insects can be stubborn, so winter is the ideal time to get on top of the problem while roses are dormant. Spray affected plants thoroughly with horticultural oil, following the winter application rate on the label. The oil works by coating the scale insects and preventing them from breathing.

Two or three applications are usually needed. Even once the scale has died, the insects may stay attached to the stems, which can make it look as though they are still alive.


Remove dead scale from stems

After spraying, use a garden hose with a firm, fine jet of water to help wash the dead scale from the rose bush. If some still remain, gently remove them with a soft scrubbing brush or firm sponge.

Some rose bushes are more prone to scale than others. It is also worth checking nearby plants in the garden, as scale can spread from other host plants and re-infest your roses. If another plant is badly affected and difficult to control, it may be best to remove it.


Keep roses healthy through summer

As the weather dries out, apply Daltons Premium Mulch & Feed around the base of your roses to help retain soil moisture and reduce weed growth. Feed with Daltons Premium Rose & Flower Fertiliser every 5–6 weeks from late October to early December, then recommence from late February through to early April.

During summer, keep an eye out for any new signs of scale. Horticultural oil can still be used at the summer rate, with repeat applications as needed. Always follow the label instructions and avoid spraying in hot sun or when plants are under stress.

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