98 MISC. PUBLICATION 650, U. S. DEPT. OF AGRICULTURE 
seedlings, but propagation expenses are lower, and the method is 
often favored for use by the unskilled labor usually available on 
plantations in tropical countries. . 
An excellent summary of methods used in the important pyrethrum- 
growing areas throughout the world has been recorded by H. J. 
Holman (12). For accounts of techniques developed in the United 
Ficure 15.—Planting pyrethrum “‘splits”; Matucana, Peru. 
States the reader may refer to the publications of Sievers,* Gnadinger 
(6, 7), and Culbertson.® 
Nurseries 
In the United States it is the general practice to use seedling stocks 
erown in outdoor seedbeds or in greenhouses. A properly located 
outdoor seedbed ought to have a southern exposure, and it should be 
8 SrevEeRs, A. F. PpYRETHRUM: ITS CULTURE AND POSSIBILITIES AS A CROP IN 
THE UNITED STATES. . U. S. Bur. Plant Indus: 7, pp., illus. [n-/d:] (Maumeas 
eraphed.} 
* CULBERTSON, R. E. INSTRUCTIONS FOR PYRETHRUM GROWING. Rpt. to 
e ee 5 R. 7 pp., Belleville, Pa. Sept. 14, 1936. [Mimeographed; filed in 
