Hertfordshire, United Kingdom
We have an Olive Tree which is in a pot. Had it for a few years now, suddenly it has developed Blackspot. I know this is not curable but the whole of the plant's leaves are effected, should I dispose of it or just keep spraying and hoping.
We've lived here not quite 2yrs and I've only just realised that one of the trees at the bottom of our garden which has always dropped its leaves also has Blackspot. It's very tall being part of a line of trees making an effective boundary for privacy. Apart from the leaves whiuch tumble it looks quite healthy and although it is some distance from the Olive wonder if this could be the culprit. This is too big to spray.
The other candidate is a small Rose I bought last year from a Garden Centre and which within a couple of weeks displayed Blackspot. This is slightly nearer the Olive.
Earlier in the year I treated my Roses with an organic mixture which included Bi-carb and I now spray fortnightly with a normal pesticide.
Anyone fighting the dreaded blackspot at the moment?
- 19 May, 2010