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black spot
despite the good feeding and watering I've been plagued by black spot again. Next spring I'm thinking of cutting them right back to about a foot in height and drenching the stems and surrounding soil with diluted jayes fluid as I've been told the black spot overwinters there. Would I be doing any harm to the soil or roses by doing this.
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thanks for your reply WB I try to all the above but am still battling with it and was thinking of turning to Jeyes as a last resort. I'll keep in mind what you have said about the pruning.cheers
make sure the leaves and any stems that drop or you cut off are put in the bin because if left will spread.
Waterbutts´ advice is excellent.
My roses suffer from black spot (along with a myriad of fungi...) because
of my garden´s poor drainage. A solution of copper sulphate is easily
available at garden centres, and does well against this stubborn disease
(be stubborn yourself, spraying every week).
Remember the black spot´s spores remain on the damp ground ready to
spring back to the plants once it rains or the plants are watered; do not allow
any fallen (diseased) leaves there. If you find an inert sort of mulching (like
pine bark), it will help prevent this "boomerang" effect.
maybe that would be the answer, I usually spray about 4 times a season, I'll try the copper sulphate next time. I took up the bark mulch a couple of years ago because I wanted to underplant with geraniums and phlox so maybe I've added to the problem without realising.
I have blackspots on the leaves of a hydrangea plant how do I get rid of it