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Posted by glenavon67 (U14868065) on Monday, 22nd August 2011
No clues, I'm looking for an honest diagnosis but obviously it's a tomato plant.
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Try this image
Something wrong with your link. Have another go.
We cross-posted.
Any sign of spots/lesions on the leaves? And is this lesion how it appeared or has it developed?
Just spotted it this morning and on closer inspection on some another nearby tomato plant, this plant also has some greying to lower leaves and on fruit fell off looking like this...
Worried now!
I think you have Late Blight.
Thought so, four years running! Argh! Anyone know of an effective treatment.
Looks like Late Blight, yes. If so, there's no treatment. Pluck off any unaffected fruit and ripen it off the vine, destroy the plant.
Forgot to add - in terms of preventing Late Blight, Early Blight and the other fungal diseases, spraying gives you the best chance. If you don't mind spraying. The chlorothalonil-based products - Daconil, etc - are by far the best. But the concentrate needs to be in at least a 29% solution before diluting. You're wasting time and money starting with less than a 29% solution. Copper-based sprays, the traditional tomato spray, are much less effective, but, on the other hand, more effective on the bacterial tomato diseases.
I am not sure that chlorothalonil is that good for blight copntrol
it is not used in the UK for such
besides I do not believe the average gardener can get their hands on it
alll the available products are based around copper now, which again is being withdrawn due to the damage they cause to the environemnt
Any product used for blight control must be used before the presence of blight
once the blight is in the plant the battle is lost
to control blight on tomatoes they are best grown in greenhouses since the humidity can be controlled
Good ventilation is critical
Chlorothalonil has been proved mighty effective against tomato fungal problems, Steve. It's widely used in the States amongst very serious tomato growers. Whether it's available to home growers in the UK is another matter. It only became available in Australia a year or so before we left and only in bulk. A group of us tomato growers chipped in, bought 50L, and divided it up. I can vouch for its effectiveness, too. Sydney, with its humidity, is fungal heaven. I had next to no problems after using it.
You're right, though, it doesn't matter what is sprayed if the spraying isn't preventive. It's too late once the spores are in place.
in different parts of the world the blight strains are different
I would think that it has little effect on blight here as it is widely used on a series of other vegetable crops
I am a little concerned what the elf and safety people would think of your comment of using the rates you recomend
Actually in the Uk i am certain it would be illegal for a gardener to use this product as it would require the correct licence
It would also be illegal for anyone to supply this to a non commercial grower
I am certain the Australians would take a far more relaxed approach to what someone does in there own back yard
Funnily enough, the Australian regulators couldn't be more hardline on such things. Products disappear from shelves every day.
Blight strains are different in different parts of the world? Obviously the American and Australian strains are similar enough for the product to work very efficiently on both. The UK might have some strain of its own, I don't know.
I have no idea what health and safety has to do with the figures I mentioned. I said the CONCENTRATE should have at least 29% of the active ingredient. It's available in lower and higher percentages. The concentrate is then diluted for use. From memory, 1 tbsp to a gallon of water.
, in reply to message 13.
Posted by farmerSteve (U2644680) on Wednesday, 24th August 2011
Regulstors in all parts of the world are different and the EU is about the toughest at the same time often showing little sense to many of its decision.
Basically they have decided that gardeners cannot be trusted with anything called a chemical
Australia is very fortunate not having the A2 strain of potato blight which has developed resistance to a lot of the active chemicals farmers use in Europe
Strangely America rarely suffers from blight as the winters are so harsh it takes care of all the volunteers where the blight overwinters
PSD, H&S and the environment agency are the regulators in the UK for pesticide usage and very strictly regulate appllication rates etc
I did misunderstand your quote of 29%
As far as I can find the only product sold in the UK is 50% concentration which does not have any clearance for potatoes
but as it can be used on strawberries with a 3 day harvest interval I am 100% sure it would be safe to use
, in reply to message 11.
Posted by Papa Nopsis (U14479902) on Thursday, 25th August 2011
Asking a tomato grower how many kilos he gets a year is like asking a bee Breeder how many hives he has got. It is not relevant but the number of Queens most certainly is.
Saying that do you grow 300--400kilos a year or more Italo?
I like talking to an expert, but I am not going to change my name to Italianpeeledplum.
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