Early on, spray thoroughly with Bordeaux mixture.
Systemic application and Bordeaux mixture in the dormant period should keep it at bay.
Around the start of the 20th century Bordeaux mixture was the primary technique for controlling the disease; in the 1940s growers shifted to synthetic chemical use.
In France, the use of Bordeaux mixture has also been known as the Millardet-David treatment.
This means Bordeaux mixture must be used pre-emptively, before the fungal disease has struck.
Bordeaux mixture can be prepared using differing proportions of the components.
Bordeaux mixture has been found to be harmful to fish, livestock and-due to potential build up of copper in the soil-earthworms.
This includes using sulfur sprays (similar to the Bordeaux mixture) until post-bloom.
Bordeaux mixture, when applied prior to flowering, has also been shown to have a preventative effect.
It is used in a fungicide called the Bordeaux mixture.