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The action of certain chemical substances on the zoospores of Pseudoperonospora Humuli (Miy. et Takah.) Wils

Published online by Cambridge University Press:  27 March 2009

W. Goodwin ,
E. S. Salmon  and
W. M. Ware
W. Goodwin
Affiliation:
(South-Eastern Agricultural College, Wye, Kent.)
E. S. Salmon
Affiliation:
(South-Eastern Agricultural College, Wye, Kent.)
W. M. Ware
Affiliation:
(South-Eastern Agricultural College, Wye, Kent.)
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Extract

1. Both Pseudoperonospora Humuli and Phytophihora infestans are extremely susceptible in the zoospore stage to the action of weak solutions of soap or saponin. The zoospores are caused to disintegrate suddenly, apparently by changes in surface tension, within 60 seconds, in solutions containing over 0·1 per cent, soft soap. Those of P. Humuli are more vulnerable than those of P. infestans.

2. The fungicidal action of soap and saponin mixed with certain adherent substances was tested on hop plants.

3. The power of adhesion and the fungicidal efficiency of the mixtures were tested by allowing single drops to dry on the surface of watch glasses and by then adding drops of water containing zoospores.

4. Other substances, e.g. aluminium-lime mixture, glycerine, iodine, bromine, were also found to kill zoospores rapidly.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 19 , Issue 1 , January 1929 , pp. 185 - 200
Copyright
Copyright © Cambridge University Press 1929

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References

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