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andyp-
had to look it up - wiki tells me that it can harm earthworms, and that when used by the United Fruit Company in the twenties "Many workers would get sick or die of poisoning due to the toxic chemical."
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Bordeaux mixture has been banned by the EU since end of 2015. You might find it hard to get hold of. You can make it up yourself but I wouldn't bother. Copper content is high - not something you want getting into the soil/into your food. Never really understood how it could be termed organic.
As an alternative (that helps a little bit) you can increase the airflow between plants by removing the lower leaves once the fruit appears. This will also help them ripen as they'll get more sunlight.
hoefla
olaf_von_pokemon
can anything stop the blight?
I've been spraying diluted milk on various things as a mild anti-fungal, but read somewhere it can cause other problems in tomatoes. the garden really does seem riddled with fungal spores of all kinds but the milk seems to be helping a little.