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.
"A. H.," Meadville, Pa., writes: "In an article ' on the best methods of destroying insects,' in the Gardener's Monthly for August, p. 238, it is stated Pyrethrum powder is death to insects and harmless to animals and plants. With regard to plants it seems to me the statement needs qualification, for its resinous qualities make it adhere to foliage so that it becomes at least a blemish to the leaves if nothing more; but it also, I think, interferes with some of the functions pertaining to foliage in vegetable economy. Please experiment and see if you do not find it so. Such is my experience."