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The Pamphlet Collection of Sir Robert Stout: Volume 14



Kaltenbach, the German entomologist, says that washing with water containing solutions of sulphur and tobacco may be advantageously employed. This was tried in 1868 in England page 31 without much benefit. The only effectual remedy would appear to be washing the plants by means of hand or horse engines, with a composition of water, soft soap, and quassia, in the following proportions:—
  • 100 gallons of water,
  • 4 to 6 lbs. of soft soap,
  • 4 to 6 lbs. of quassia (extract after well boiling).

Water alone would be effectual, only it runs off the web-covered leaves. The soap fixes it on them, and the bitter of the quassia makes them unpleasant to the tastes of the red spiders.