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#1
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Powdery Mildew on Tuberous Begonias
Just noticed there is the first signs of Powdery Mildew attacking the leaves
of some of my Tuberous Begonias. It's normally an autumn thing but I assume this unusually cold wet weather has brought it on early. Everything I look at in the Garden Centres specifically says not to be used on Begonias, or it does when you search the manufacturers web site. These are some expensive show begonias and some I inherited from my mother in 1993 so I don't want to lose any of them. Anyone know what I can use to cure or prevent it spreading? -- Regards Bob Hobden Posting to this Newsgroup from the W.of London. UK |
#2
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Powdery Mildew on Tuberous Begonias
On Fri, 8 Jun 2012 11:01:48 +0100, "Bob Hobden"
wrote: Just noticed there is the first signs of Powdery Mildew attacking the leaves of some of my Tuberous Begonias. It's normally an autumn thing but I assume this unusually cold wet weather has brought it on early. Everything I look at in the Garden Centres specifically says not to be used on Begonias, or it does when you search the manufacturers web site. These are some expensive show begonias and some I inherited from my mother in 1993 so I don't want to lose any of them. Anyone know what I can use to cure or prevent it spreading? -- Regards Bob Hobden Posting to this Newsgroup from the W.of London. UK According to RHS, there are now no effective curative fungicides available for domestic use anyway. But I BELIEVE that Bayer Fungus Fighter Disease Control is OK to use on begonias and has some preventive impact - you should be using it almost as soon as leaves emerge sort of thing. If the infection is very recent, though, it may help. I've checked Bayer web site and they don't say "not on begonias" for this product but suggest you check with Bayer Customer Services to be sure. Otherwise it's a case of quick removal of any infected leaves and all fallen plant matter, drying the atmosphere, creating air flow (removing some unaffected foliage may mean they're not show worthy this year but be life-saving for next) and crossing fingers. Cheers, Jake ======================================= Urgling from Swansea Bay. Dave's at that end; I'm at this end. Bill's in the middle. |
#3
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Powdery Mildew on Tuberous Begonias
"Jake" wrote
"Bob Hobden" wrote: Just noticed there is the first signs of Powdery Mildew attacking the leaves of some of my Tuberous Begonias. It's normally an autumn thing but I assume this unusually cold wet weather has brought it on early. Everything I look at in the Garden Centres specifically says not to be used on Begonias, or it does when you search the manufacturers web site. These are some expensive show begonias and some I inherited from my mother in 1993 so I don't want to lose any of them. Anyone know what I can use to cure or prevent it spreading? According to RHS, there are now no effective curative fungicides available for domestic use anyway. But I BELIEVE that Bayer Fungus Fighter Disease Control is OK to use on begonias and has some preventive impact - you should be using it almost as soon as leaves emerge sort of thing. If the infection is very recent, though, it may help. I've checked Bayer web site and they don't say "not on begonias" for this product but suggest you check with Bayer Customer Services to be sure. Otherwise it's a case of quick removal of any infected leaves and all fallen plant matter, drying the atmosphere, creating air flow (removing some unaffected foliage may mean they're not show worthy this year but be life-saving for next) and crossing fingers. I think that contains Myclobutanil and looking at the RHS Advisory Leaflet it says "Do not use on fuchsias, begonias, asters, solidago and young seedlings". Similar for anything containing Difenoconazole. Perhaps I'll try the 1 part (full or skimmed) milk to 9 parts water, or maybe the Bicarbonate of Soda spray, (1 tbs baking soda, 1/2 teaspoon liquid soap to 1 gal water) but I think that would need to be tested first on one plant. What I can't believe is it has appeared first on the plants that have been outside for 3 weeks so hardly dry at the roots or lacking in air movement! -- Regards. Bob Hobden. Posted to this Newsgroup from the W of London, UK |
#4
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Powdery Mildew on Tuberous Begonias
"Bob Hobden" wrote
"Jake" wrote "Bob Hobden" wrote: Just noticed there is the first signs of Powdery Mildew attacking the leaves of some of my Tuberous Begonias. It's normally an autumn thing but I assume this unusually cold wet weather has brought it on early. Everything I look at in the Garden Centres specifically says not to be used on Begonias, or it does when you search the manufacturers web site. These are some expensive show begonias and some I inherited from my mother in 1993 so I don't want to lose any of them. Anyone know what I can use to cure or prevent it spreading? According to RHS, there are now no effective curative fungicides available for domestic use anyway. But I BELIEVE that Bayer Fungus Fighter Disease Control is OK to use on begonias and has some preventive impact - you should be using it almost as soon as leaves emerge sort of thing. If the infection is very recent, though, it may help. I've checked Bayer web site and they don't say "not on begonias" for this product but suggest you check with Bayer Customer Services to be sure. Otherwise it's a case of quick removal of any infected leaves and all fallen plant matter, drying the atmosphere, creating air flow (removing some unaffected foliage may mean they're not show worthy this year but be life-saving for next) and crossing fingers. I think that contains Myclobutanil and looking at the RHS Advisory Leaflet it says "Do not use on fuchsias, begonias, asters, solidago and young seedlings". Similar for anything containing Difenoconazole. Perhaps I'll try the 1 part (full or skimmed) milk to 9 parts water, or maybe the Bicarbonate of Soda spray, (1 tbs baking soda, 1/2 teaspoon liquid soap to 1 gal water) but I think that would need to be tested first on one plant. What I can't believe is it has appeared first on the plants that have been outside for 3 weeks so hardly dry at the roots or lacking in air movement! Now received a reply from Blackmore and Langdon (top begonia specialists) and this is what they say should anyone else have this problem... "Sorry to hear your having a problem with mildew, this can be a nightmare and there doesn't seem to be any rhyme or reason as to why and when it appears. We have been recommending and selling a product called 'Fungus Clear Ultra', certainly works very well on begonias we have treated here. I am pretty sure you can purchase this in the garden centres but if you would like to save the hassle of hunting for it I can post you a pack (enough to make 15 litres)." -- Regards Bob Hobden Posting to this Newsgroup from the W.of London. UK |
#5
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Powdery Mildew on Tuberous Begonias
"Martin" wrote
On Fri, 8 Jun 2012 16:39:43 +0100, "Bob Hobden" wrote: snip Now received a reply from Blackmore and Langdon (top begonia specialists) and this is what they say should anyone else have this problem... "Sorry to hear your having a problem with mildew, this can be a nightmare and there doesn't seem to be any rhyme or reason as to why and when it appears. We have been recommending and selling a product called 'Fungus Clear Ultra', certainly works very well on begonias we have treated here. I am pretty sure you can purchase this in the garden centres but if you would like to save the hassle of hunting for it I can post you a pack (enough to make 15 litres)." Better order a pack before it is banned :-) It's in most GCs so just got a bottle from my local one and have already treated all the Begonias. Did you know that Bordeaux Mixture becomes withdrawn from sale in the UK from 28th Feb 2013 but you can use and store existing stocks until 28 February 2015. -- Regards. Bob Hobden. Posted to this Newsgroup from the W of London, UK |
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