This section is from the book "The Gardener's Monthly And Horticulturist V23", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Paris green and London purple are the most effective where a strong poison can be applied. They are not soluble or only a small per cent., hence to use them with water it must be continually stirred. A tablespoonful to a barrel of water will be a strong poison for any insects.
Pyrethrum powder, when fresh, is death to insect life and harmless to plants and animals.
Nothing is more deadly to insects than oil, it obstructs their respiratory organs, which are situated on the sides of the abdomen.
To mix oils with water, first combine them with milk, then dilute to the desired degree with water. Hot water is one of the simplest and cheapest remedies, always effectual.
[This is one of the interesting papers read before the meeting of the Nurserymen's Association at Dayton last month. - Ed. G. M.]