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Preparation of the indicator Cabbage juice: Half a head of red cabbage is chopped up finely. The cabbage is covered with 800 mL of boiling water. The juice cooled down to room temperature is sieved and 5 mL of ethanol are added. The liquid should be a dark reddish-purple color.
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A widespread pest for gardeners but, according to agricultural scientists, of little significance in commercial brassica crops. As a consequence, little research is currently being done on controlling this 'garden' pest.
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