The fungicidal properties of certain spray-fluids. III

Author:

Horton E.,Salmon E. S.

Abstract

The following solutions were tested with respect to their fungicidal properties towards the “powdery,” conidial stage of S. Humuli on young hop-leaves in the greenhouse:(1) Disodium arsenate, containing 0·096 per cent. As2O5 proved fungicidal and killed also patches of leaf-cells underlying the mildewpatches, but did not otherwise injure the leaf. A solution containing 0·02 per cent. As2O5 was fungicidal without killing any leaf-cells.(2) Trisodium arsenate containing 0·077 per cent. As2O5 proved fungicidal.(3) Dicalcium arsenate. containing 0·048 per cent. As2O5 proved fungicidal; containing 0·024 per cent. As2O5 the solution was apparently just fungicidal, but with 0·01 per cent. As2O5 the solution was practically non-fungicidal.(4) Tricalcium arsenate containing 0·076 per cent. As2O5 is fungicidal; containing 0·02 per cent. As2O5 it possesses some fungicidal value, but with 0·01 per cent. As2O5 it is practically non-fungicidal.(5) The following constituents of lime-sulphur wash proved nonfungicidal: calcium sulphate, sulphite, thiosulphate, hydroxyhydrosulphide.(6) Calcium polysulphide, at a strength of 0·11 per cent., proved fungicidal.

Publisher

Cambridge University Press (CUP)

Subject

Genetics,Agronomy and Crop Science,Animal Science and Zoology

Reference20 articles.

1. Lime-Sulphur and Calcium Caseinate as a Fungicide;Salmon;Journ. Min. Agric.,1922

2. Chemische Zusammensetzung und Wertbestimmung von Schwefelkalkbrühe;Bodnar;Chem. Zeit.,1915

3. The Composition of Lime-Sulphur Solutions;Thompson;Delaware Stat. Bull.,1914

4. The Preparation and Composition of Lime-Sulphur Sprays

5. The Fungicidal Properties of Certain Sprayfluids;Eyre;Journ. Agric. Science,1919

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