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  Glen Stillman May 1, 2019 at 11:10am

  Meticulous house keeping ie removing all fallen rose leaves from border, healthy or not. Can air movement be improved at all ie thin out crowded plants, may be even remove any badly positioned plants, lift tree canopy, cut back near by shrubs? 
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  Progreen Weed Control May 1, 2019 at 2:20pm

  Hi Niall,

  Have emailed you a couple of suggestions direct. As we discussed many of the smaller pack products have been withdrawn (Systhane) so there are not many that specialise in black spot for roses but a couple of horticultural options, for bigger areas....

  Richard@Progreen
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  Andrew Midgley May 1, 2019 at 7:29pm

  I use Uncle Tom's Rose Tonic as healthy roses are more resistance to diseases. Correct pruning and feeding is also essential and as mentioned  removing infected leaves from the plant/ soil is a must. 
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  David Benson May 1, 2019 at 10:56pm

  with hinesight you should of started spraying them a few weeks ago then spray at least every 2 weeks and the soil too, a good mulch of farm yard manure after you have cleard the fallen leaves.

  roses are a high maintance job to keep them right  
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    dan > David Benson May 2, 2019 at 8:22am

    The trouble is some roses are more susecptable to black spot than others -- modern breeding does produce much more resistant types - so it may be worth looking at trialing some more resistant types to see if its worth starting to replant some of them over time. 

    As above healthy plants and soil is the first step - good feeding /pruning and care will help -- i would have thought liquid seaweed could be helpfull as it appears to have anti fungal properties -- either root drench or foliar spray might help. 

    Regarding the off the shelf fungicides - they do want to be applied once plants are in full leaf - 'before' the black spot appears. 

    Good luck and let us know what works or doesnt for you this year.