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Fungicide for botrytis on grape vine
Has anyone any suggestions for a suitable fungicide for botrytis on a
grape vine, please? My vines are in a polytunnel and suffer from botrytis each year. I understand that the time to spray them is when in flower, which is now. Unfortunately, all the treatments mentioned in my books seem to have been withdrawn from sale and I cannot find one that is indicated for this mould. -- Howard Neil |
Fungicide for botrytis on grape vine
The message
from Howard Neil contains these words: Has anyone any suggestions for a suitable fungicide for botrytis on a grape vine, please? My vines are in a polytunnel and suffer from botrytis each year. I understand that the time to spray them is when in flower, which is now. Unfortunately, all the treatments mentioned in my books seem to have been withdrawn from sale and I cannot find one that is indicated for this mould. Bordeaux mixture. You can make it from lime and copper sulphate if you can't get it. Proportions aren't critical. I think Murphy's Dinacap (Dinocap? Dynacap?) treats botrytis. -- Rusty Open the creaking gate to make a horrid.squeak, then lower the foobar. http://www.users.zetnet.co.uk/hi-fi/ |
Fungicide for botrytis on grape vine
Jaques d'Alltrades wrote:
Bordeaux mixture. You can make it from lime and copper sulphate if you can't get it. Proportions aren't critical. I think Murphy's Dinacap (Dinocap? Dynacap?) treats botrytis. Thank you very much for the suggestions. I will try the Bordeaux mixture this year as it looks to be less toxic. I would rather start gently. -- Howard Neil |
Fungicide for botrytis on grape vine
I'd have thought that Mildew would also be a problem for grapes in a poly
tunnel. Again Bordeaux Mixture should work, but you must start spraying BEFORE any signs of trouble, it will help prevent, but won't cure. -- David Hill Abacus nurseries www.abacus-nurseries.co.uk |
Fungicide for botrytis on grape vine
David Hill wrote:
I'd have thought that Mildew would also be a problem for grapes in a poly tunnel. Again Bordeaux Mixture should work, but you must start spraying BEFORE any signs of trouble, it will help prevent, but won't cure. My intention is to start spraying within the next week. How frequently should I repeat the spraying, please? -- Howard Neil |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Howard Neil wrote:
David Hill wrote: I'd have thought that Mildew would also be a problem for grapes in a poly tunnel. Again Bordeaux Mixture should work, but you must start spraying BEFORE any signs of trouble, it will help prevent, but won't cure. My intention is to start spraying within the next week. How frequently should I repeat the spraying, please? Every ten days to a fortnight. I always spray with a mixture of bordeaux and Dithane. One takes care of downy mildew and the other powdery mildew. Both these mildews can attack at any time and you can lose the whole crop. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Fri, 7 May 2004, Howard Neil wrote:
My vines are in a polytunnel and suffer from botrytis each year. I understand that the time to spray them is when in flower, which is now. Er, no. When they are in flower is just when you *shouldn't* spray! -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
David Rance wrote:
Every ten days to a fortnight. I always spray with a mixture of bordeaux and Dithane. One takes care of downy mildew and the other powdery mildew. Both these mildews can attack at any time and you can lose the whole crop. Thanks. -- Howard Neil |
Fungicide for botrytis on grape vine
David Rance wrote:
On Fri, 7 May 2004, Howard Neil wrote: My vines are in a polytunnel and suffer from botrytis each year. I understand that the time to spray them is when in flower, which is now. Er, no. When they are in flower is just when you *shouldn't* spray! The books that I have (including RHS ones) all advise that the time to spray grapes against botrytis is when they are in flower. Mind you, they are a little old and advise spraying with fungicides that are no longer available and make no mention of Bordeaux mixture. What is your reason for advising against it, please? -- Howard Neil |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Howard Neil wrote:
David Rance wrote: Every ten days to a fortnight. I always spray with a mixture of bordeaux and Dithane. One takes care of downy mildew and the other powdery mildew. Both these mildews can attack at any time and you can lose the whole crop. Thanks. In fact, I have my doubts as to whether Bordeaux Mixture will be of any use with botrytis (grey mould). I can find no recommendations to its use for botrytis in any of my books or on the web. Instead there seems to be greater emphasis on cleanliness of the soil and the vine, i.e. don't leave any dead leaves around. My advice would be to remove the polytunnel when the grapes are approaching ripeness because it is then that they are most prone to botrytis developing. Of course, you still need to spray regularly against powdery and downy mildews. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Howard Neil wrote:
Er, no. When they are in flower is just when you *shouldn't* spray! The books that I have (including RHS ones) all advise that the time to spray grapes against botrytis is when they are in flower. Mind you, they are a little old and advise spraying with fungicides that are no longer available and make no mention of Bordeaux mixture. What is your reason for advising against it, please? "Spray the vines with the above mixture (Bordeaux Mixture, Dithane and Maxicrop) every two weeks until flowering when all spraying must cease." - Growing Grapes in Britain by Gillian Pearkes. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, David Rance wrote:
In fact, I have my doubts as to whether Bordeaux Mixture will be of any use with botrytis (grey mould). Hmmm, I've just checked in one of my German books on viticulture (Weinbau by Vogt & Götz, 1979) - "Copper, and many of the hitherto organic, fungicides are not effective or, at least, not completely effective, against botrytis." Of course, Bordeaux Mixture is based on copper. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004 00:20:07 +0100, "David Hill"
wrote: I'd have thought that Mildew would also be a problem for grapes in a poly tunnel. Again Bordeaux Mixture should work, but you must start spraying BEFORE any signs of trouble, it will help prevent, but won't cure. There are EU/UK restrictions on the use of Bordeaux Mix, because it contains copper sulphate, see www.ruralni.gov.uk/pdfs/publications/ Bulletin%20Summer%2002.pdf and http://www.organic-research.com/Laws...ection_eu1.asp Google for more info. |
Fungicide for botrytis on grape vine
David Rance wrote:
In fact, I have my doubts as to whether Bordeaux Mixture will be of any use with botrytis (grey mould). I can find no recommendations to its use for botrytis in any of my books or on the web. I had a search yesterday when Bordeaux mixture was first suggested. I managed to find a couple of references to it being useful against botrytis. In the absence of anything else, I am willing to give it a try. At the very least it should protect against mildew. Instead there seems to be greater emphasis on cleanliness of the soil and the vine, i.e. don't leave any dead leaves around. My advice would be to remove the polytunnel when the grapes are approaching ripeness because it is then that they are most prone to botrytis developing. This is not an option. The polytunnel is 65ft x 17ft and the poly is correctly stretched and anchored under the ground. There would also be an issue with other plants in the polytunnel. -- Howard Neil |
Fungicide for botrytis on grape vine
David Rance8/5/04 10:05
snip "Spray the vines with the above mixture (Bordeaux Mixture, Dithane and Maxicrop) every two weeks until flowering when all spraying must cease." - Growing Grapes in Britain by Gillian Pearkes. Totally irrelevant to the subject but she was the sister of our Rector! In the Lots we saw vineyards growing rose bushes at the end of each row of vines as they give the earliest hint of problems. But there, everything was covered in a bright blue mixture of some sort ?colldodial copper? This would have been around July or August, IIRC. -- Sacha www.hillhousenursery.co.uk South Devon (remove the weeds to email me) |
Fungicide for botrytis on grape vine
David Rance wrote:
On Sat, 8 May 2004, Howard Neil wrote: Er, no. When they are in flower is just when you *shouldn't* spray! The books that I have (including RHS ones) all advise that the time to spray grapes against botrytis is when they are in flower. Mind you, they are a little old and advise spraying with fungicides that are no longer available and make no mention of Bordeaux mixture. What is your reason for advising against it, please? "Spray the vines with the above mixture (Bordeaux Mixture, Dithane and Maxicrop) every two weeks until flowering when all spraying must cease." - Growing Grapes in Britain by Gillian Pearkes. Thanks. I re-checked my book and they all refer to spraying with Benlate at flowering. From what you are saying, I presume that I have now missed the opportunity to spray with Bordeaux mixture and will have to wait till next winter. -- Howard Neil |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Howard Neil wrote:
Instead there seems to be greater emphasis on cleanliness of the soil and the vine, i.e. don't leave any dead leaves around. My advice would be to remove the polytunnel when the grapes are approaching ripeness because it is then that they are most prone to botrytis developing. This is not an option. The polytunnel is 65ft x 17ft and the poly is correctly stretched and anchored under the ground. There would also be an issue with other plants in the polytunnel. Then I wish you luck! A polytunnel is not the ideal situation for growing grapes needing, as they do, fresh air to circulate around them. Vines have been grown under glass in Britain very successfully, but there are always ventilators to allow fresh air to circulate freely. If you have greater success this year do let me know as I would be very interested. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Sat, 08 May 2004 12:13:34 +0100, Sacha
wrote: David Rance8/5/04 10:05 $JrilaAaLKnAFwEZ @mesnil.demon.co.uk snip "Spray the vines with the above mixture (Bordeaux Mixture, Dithane and Maxicrop) every two weeks until flowering when all spraying must cease." - Growing Grapes in Britain by Gillian Pearkes. Totally irrelevant to the subject but she was the sister of our Rector! In the Lots we saw vineyards growing rose bushes at the end of each row of vines as they give the earliest hint of problems. But there, everything was covered in a bright blue mixture of some sort ?colldodial copper? Copper Sulphate? This would have been around July or August, IIRC. Near Treguier, in Brittany, about 10 years ago, a young French couple had a wonderful garden full of rare vegetables, sadly not enough people visited it and selling the vegetables alone didn't produce enough income, so they went bust. |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Sacha wrote:
"Spray the vines with the above mixture (Bordeaux Mixture, Dithane and Maxicrop) every two weeks until flowering when all spraying must cease." - Growing Grapes in Britain by Gillian Pearkes. Totally irrelevant to the subject but she was the sister of our Rector! I knew she lived down in the West Country but I wasn't exactly sure where. When I first started growing vines (back in the 1970s) her book was just about the only one in English on vine growing. She was among the pioneers of the new wave of viticulturists and did valuable experimental work. Most of her work is still relevant though the types of vine she recommends are a bit out of date simply because new varieties are now available. In the Lots we saw vineyards growing rose bushes at the end of each row of vines as they give the earliest hint of problems. But there, everything was covered in a bright blue mixture of some sort ?colldodial copper? This would have been around July or August, IIRC. Many French vineyards have roses growing at the end of each row for the very reason you mention. I've seen it down in Burgundy. The bright blue mixture was undoubtedly some form of Bordeaux mixture. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004, Howard Neil wrote:
Thanks. I re-checked my book and they all refer to spraying with Benlate at flowering. From what you are saying, I presume that I have now missed the opportunity to spray with Bordeaux mixture and will have to wait till next winter. Not at all. Wait until flowering is over and then you must continue spraying every ten to fourteen days until about a fortnight before the grapes are ready for picking. You'll need to do this because the powdery and downy mildews can strike at any time. -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
Fungicide for botrytis on grape vine
David Rance wrote:
On Sat, 8 May 2004, Howard Neil wrote: Thanks. I re-checked my book and they all refer to spraying with Benlate at flowering. From what you are saying, I presume that I have now missed the opportunity to spray with Bordeaux mixture and will have to wait till next winter. Not at all. Wait until flowering is over and then you must continue spraying every ten to fourteen days until about a fortnight before the grapes are ready for picking. You'll need to do this because the powdery and downy mildews can strike at any time. Understood now. I have also just found a suggested fungicide called carbendazim. The Pesticides Safety Directorate still show this as licensed so I have fired off a couple of e-mails to producing companies to find out about availability. -- Howard Neil |
Fungicide for botrytis on grape vine
David Rance wrote:
On Sat, 8 May 2004, Howard Neil wrote: Instead there seems to be greater emphasis on cleanliness of the soil and the vine, i.e. don't leave any dead leaves around. My advice would be to remove the polytunnel when the grapes are approaching ripeness because it is then that they are most prone to botrytis developing. This is not an option. The polytunnel is 65ft x 17ft and the poly is correctly stretched and anchored under the ground. There would also be an issue with other plants in the polytunnel. Then I wish you luck! A polytunnel is not the ideal situation for growing grapes needing, as they do, fresh air to circulate around them. Vines have been grown under glass in Britain very successfully, but there are always ventilators to allow fresh air to circulate freely. If you have greater success this year do let me know as I would be very interested. Will do. -- Howard Neil |
Fungicide for botrytis on grape vine
My old "Bible" recommends dusting with sulphur for downy mildew on vines.
I would think if you could leave both ends of the poly tunnel open all the time and if you could put a fan about 1/3rd of the way down the house and fit a timer to bring it on for 15 mins every hour to prevent a build up of stagnant air then you could well avoid the problem. -- David Hill Abacus nurseries www.abacus-nurseries.co.uk |
Fungicide for botrytis on grape vine
David Hill wrote:
My old "Bible" recommends dusting with sulphur for downy mildew on vines. I would think if you could leave both ends of the poly tunnel open all the time and if you could put a fan about 1/3rd of the way down the house and fit a timer to bring it on for 15 mins every hour to prevent a build up of stagnant air then you could well avoid the problem. I do leave both ends open all the time when the weather is warm enough. The idea of the fan is interesting. Electricity supply will be difficult but the problems are not insurmountable. I already have a spare fan that could be used. -- Howard Neil |
Fungicide for botrytis on grape vine
On Sat, 8 May 2004 10:20:49 +0100, David Rance =
g.uk said: ] On Sat, 8 May 2004, David Rance wrote: ]=20 ] In fact, I have my doubts as to whether Bordeaux Mixture will be of any= =20 ] use with botrytis (grey mould). ]=20 ] Hmmm, I've just checked in one of my German books on viticulture=20 ] (Weinbau by Vogt & G=F6tz, 1979) - "Copper, and many of the hitherto=20 ] organic, fungicides are not effective or, at least, not completely=20 ] effective, against botrytis." Of course, Bordeaux Mixture is based on=20 ] copper. ]=20 David, none the less it is what they treat with, AFAIK, in Bordeaux... -E --=20 Emery Davis You can reply to by removing the well known companies |
Fungicide for botrytis on grape vine
If you go abroad on holiday and go somewhere they grow grapes in small
vineyards (Such as in Malta), then the local farmers suppliers will have fungicides in smallish quantities and at very reasonable prices. I picked up a very good one, (wide spectrum) this year, 250ml for around the equivalent of £7.00 sterling, Instructions in Italian and English, and you apply at 1ml per 5 litres of water. Should be no problem as it is sourced within the EU. -- David Hill Abacus nurseries www.abacus-nurseries.co.uk |
Fungicide for botrytis on grape vine
Copper oxalate is in some fungicides. It has a similar blue to the sulphate.
Edwin. --------- Sacha wrote: ... Totally irrelevant to the subject but she was the sister of our Rector! In the Lots we saw vineyards growing rose bushes at the end of each row of vines as they give the earliest hint of problems. But there, everything was covered in a bright blue mixture of some sort ?colldodial copper? This would have been around July or August, IIRC. .... |
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