K. C. BARRONS ^93 



growth-regulating substances more efficient than 2,4-D or 2,4,5-T for 

 the control of many species such as ash, smilax, and certain oaks and 

 maples. Although existing chemicals have some effect on cattails, bracken 

 fern, and horsetail we need something more efficient for their control. 

 Translocation of 2,4-D and 2,4,5-T to the root systems of some weeds 

 is inefficient, as is the case with milkweed and leafy spurge. Better 

 herbicides or improved knowledge of how to use our present ones is 

 needed for such plants. We need chemicals with specific growth-con- 

 trolling action but without lethal effect for use on trees and shrubs 

 as well as on grasses and certain herbaceous plants. There is need for a 

 chemical for the control of all plant growth on railroad beds and other 

 areas where no vegetation is wanted. Possibly a nonselective herbicide 

 of the growth-regulating type is not beyond the realm of possibility. 



REFERENCES 



1. Barrons, K. C, Down to Earth, 4(4) :8 (1949). 



2. Barrons, K. C. and Coulter, L. L., ibid., 4(2) :4 (1948). 



3. ScHOENE, D. L. and Hoffman, Otto L., Science, 109:588-90 (1949). 



