This section is from the book "The Gardener's Monthly And Horticulturist V24", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Mr. Zimmerman, one of America's best entomologists, has reprinted a paper which appeared originally in the Agricultural Review, under the above title, and which is of an admirable practical character. We learn from it that the plan recently made known by Professor Burrill, that a weak solution of Paris Green sprinkled over an apple tree soon after blossoming, is a cheap and effectual means of protecting apples from injury from the codling moth. "Buhach" is made in California from Pyrethrum cinerarisefolium, and, like Persian insect powder is effectual in destroying insect life, and harmless to plants and animals. Oil is destructive to insect life. To cause oil to mix with water, first combine with milk and then dilute with water. When the Gardener's Monthly first introduced hot water as an insecticide it was careful to say dip for an instant in a temperature of 120° to 130°. Mr. Zimmerman says 150° to 210°. We have not tried at this temperature, indeed have found injury to tender leaves at 130°. What are the experiences of others? Mr. Z. says as a special point, that water at 210°, in the form of spray, will not injure a cabbage.
This ought to be comfort to those who desire to go to war with the cabbage caterpillar.
We give these as a sample of the latest information profusely given in this valuable paper.