There are very few data at hand concerning the discovery of the insecticide properties of pyrethrum.
"Scientific American Supplement No. 299" by Various
Prof. Riley states that the insects are very readily destroyed by pyrethrum.
"Scientific American Supplement, No. 803, May 23, 1891" by Various
George treated his with pyrethrum powder.
"The Library of Work and Play: Gardening and Farming." by Ellen Eddy Shaw
Mr. Earle will try pyrethrum next season for the tarnished bug.
"Prairie Farmer, Vol. 56: No. 1, January 5, 1884." by Various
Pyrethrum, F. H. Ellison, Minneapolis, second premium, $1.00.
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
Another remedy is pyrethrum.
"Cabbages and Cauliflowers: How to Grow Them" by James John Howard Gregory
The fumes of burning Pyrethrum powder (Persian insect powder), used in the proportion of 2 lbs.
"How to Live" by Irving Fisher and Eugene Fisk
Pyrethrum is used as a spray, mixing one ounce to two gallons of water, to destroy cabbage-worms and many other garden insects.
"Checking the Waste" by Mary Huston Gregory
To clean the room where there are many flies, burn pyrethrum powder (Persian insect powder).
"The Eugenic Marriage, Volume IV. (of IV.)" by Grant Hague
The remedy prescribed is a powder in which pyrethrum is the chief ingredient, sprinkled about the shelves.
"A Book for All Readers" by Ainsworth Rand Spofford
Make it a point to keep the larger-growing kinds, such as Coleus, Pyrethrum and Centaurea, under six inches in height rather than over it.
"Amateur Gardencraft" by Eben E. Rexford
Pyrethrum, anthemis pyrethrum, tobacco, cloves, pepper, cowhage, stizolobium siliqua hirsuta.
"Zoonomia, Vol. II" by Erasmus Darwin
Howard recommends thoroughly rubbing into the fur a quantity of pyrethrum powder.
"Handbook of Medical Entomology" by William Albert Riley
After the plants begin to head, pyrethrum or salt water may be used.
"The Practical Garden-Book" by C. E. Hunn
The pyrethrum may be used dry or in water, at the rate of a tablespoonful to two gallons.
"Farm Gardening with Hints on Cheap Manuring" by Anonymous
In other cases pyrethrum or tobacco powder, wood ashes, etc., have been employed against insects.
"Disease in Plants" by H. Marshall Ward
Insect powder (pyrethrum) will help keep out "croton bugs" and other undesirable household pests, but cleanliness will do far more.
"A Civic Biology" by George William Hunter
If the flies are very numerous, catch them in wire traps, or burn pyrethrum powder in the room.
"Foods and Household Management" by Helen Kinne