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Further Observations on the Fungicidal Action of Bordeaux Mixtures
Published online by Cambridge University Press: 27 March 2009
Extract
In earlier papers (this Journal, vol. IV. pp. 69 and 76) we have detailed the experimental evidence which led us to conclude (1) that the view as to the fungicidal action of Bordeaux mixtures favoured by Pickering, viz. the liberation of copper sulphate by atmospheric carbon dioxide, is untenable; and (2) that contact between the fungus and the copper compound present in the mixture will account largely for its efficiency owing to a solvent action on the part of the organism under certain conditions. Pickering (this Journal, V. p. 273) has criticised our general conclusions and the deductions which we have drawn from certain of our experiments; and therefore before describing our further work on the subject, a brief reference to some of the points which he has raised is desirable.
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References
page 222 note 1 In view of this, we have throughout recorded as nil, any amount of copper less than that which will give a visible colour with ferrocyanide, although fully aware that in many cases by concentration of the liquid, copper might have been detected in solution.
page 230 note 1 Further work on the influence of injuries upon the “scorching” of foliage by Bordeaux mixtures and on the absorption of copper by plants is described in a paper shortly to be published in the Annals of Economic Biology.
page 231 note 1 Further work on the influence of injuries upon the “scorching” of foliage by Bordeaux mixtures and on the absorption of copper by plants is described in a paper shortly to be published in the Annals of Economic Biology.