FOREWORD 



Research in the field of weed control with chemicals 

 is conducted by the United States Department of Agri- 

 culture, State agricultural experiment stations, and 

 industrial organizations. Representatives of these 

 groups meet periodically in the Weed Society of America 

 and in four regional conferences to discuss research 

 developments in chemical weed control and to formulate 

 suggestions on control practices. Some of the suggested 

 weed-control practices of the conferences are sum- 

 marized in this report in order to make them generally 

 available to agricultural workers in the various States 

 who advise with farm people. 



The effectiveness of herbicides is influenced by soil 

 type, temperature, rainfall, and other soil and climatic 

 factors. Because of this, the suggestions in this report 

 should be evaluated in terms of local conditions and 

 local experience. In a specific State, the recommenda- 

 tions of the agricultural experiment station and the 

 agricultural extension service should be followed. 

 Where such recommendations are not available, the 

 suggestions in this report should be looked upon as a 

 general guide. 



This is a revision of, and supersedes, ARS 22-23, 



"Suggested Guide for Chemical Control of 



Weeds," April 1956 



