12 THE CONTROL OF COTTON WILT AND ROOT-KNOT. 



of the growing crops by experts and after an oilicial test of the seed 

 placed on sale by the breeder in comparison witli standard resistant 

 strains. 



HOW TO SECURE INFORMATION. 



The farmer who has had trouble with wilt or root-knot may secure 

 help from the nearest agent of the Farmers' Cooperative Demonstra- 

 tion Work or by addressing Prof. H. W. Barre, Clemson College, 

 S. C, or Mr. A. C. Lewis, Capitol Building, Atlanta, Ga., who will 

 advise him witli regard to the diseases and the best methods of control- 



HOW TO SECURE RESISTANT SEED. 



As a result of the cooperative breeding work that has been carried 

 on during the past season, a considerable supply of wilt-resistant 

 cotton seed of the Dixie and Dillon varieties has been produced by 

 cooperating farmers under the supervision of our representatives in 

 Georgia and South Carolina. This seed is now for sale by them at a 

 price not to exceed $1.50 a bushel. Parties desiring to secure any 

 of this seed for planting shoidd \vrite immediately to Prof. Barre or 

 to Mr. Lewis, stating how much seed is desired. An order on the 

 cooperative breeder nearest them for the desired quantity of seed 

 will then be sent them, together with the price to be paid. This 

 order, accompanied by the necessary money, must be sent by the 

 purchasing farmer to the breeder, who will immediately ship the seed. 

 Shipment by freight or express should be specified, all charges to be 

 paid by the purchaser. 



THE PRINCIPLES OF BREEDING. 



To maintain the quality of an established cotton variety it has 

 generally been believed that it is only necessary to grow the cotton 

 in a field as far separated from other cotton fields as circumstances 

 permit, to pull out all plants of undesirable character (the process of 

 "roguing" in the language of seed growers), and to exercise care at 

 the gin to avoid mixture with other cotton. All this is indeed 

 imperative, but it has been found that one step farther is necessary 

 to accomplish the best results and that step is to practice the progeny- 

 row method of breeding. 



Tliis method depends on tlie simple fact that plants differ not only 

 in their visible characters but also in their ability to transmit these 

 characters to their oflspring. Cotton should be very uniform in 

 length and quality, but the greatest variation exists in an unselected 

 field. Some plants taken from each field produce variable offspring, 

 while others produce uniform offspring, give a larger yield, a higher 

 lint percentage, and a better staple. 



[Cir. 92] 



