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Sunday, 29 April 2012

An effective fungicide that can be prepared easily for garden plants- BORDEAUX MIXTURE (1%)


As we all know, a quality fungicide is an essential thing for homestead cultivators. For protecting their plants from fungus attack it is inevitable. Let us see how to make such a fungicide known as Bordeaux mixture.
Preparation:
Dissolve 1 kg of powdered copper sulphate crystals in 50 litres of water. In another 50 litres of water, prepare milk of lime with 1 kg of quick lime. Pour the copper sulphate solution in to the milk of lime slowly stirring the mixture all the while. Bordeaux mixture 1% is ready for use. Test the mixture before use for the presence of free copper, which is harmful to the plants, by dipping a polished knife in it. If the blade shows a reddish colour due to the deposits of copper, add more lime till the blade is not stained on dipping. Always use wooden, earthen or copper vessels for the preparation of Bordeaux mixture.
                          In order to confer sticking quality to Bordeaux mixture, rosin washing soda mixture, may be added. The addition of the sticker is particularly recommended for spraying conducted during rainy season. For preparing the mixture, 10 litres of water out of 100 litres required for preparing Bordeaux mixture may be kept apart. Boil 10 litres of water, preferably in earthen pot and add 500gm good quality washing soda (sodium carbonate) .Boil again until the solution becomes slightly dark in colour. Add 1 kg powdered rosin (arpoos) in the boiling washing soda solution. Reduce the flame for avoiding frothing, foaming and spilling over. Boil the solution for 5-10 minutes till black bubbles appear. Cool the solution until the temperature reaches below 45 degree Celsius. The cooled mixture (10 litres) is then added slowly to the prepared Bordeaux mixture (90 litres) under vigorous stirring.












courtesy : Kerala Agricultural University    
     
  
                          

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