K. C. BARRONS 19^ 



fence line. Where tall-growing or otherwise obnoxious weeds are present 

 2,4-D and sometimes 2,4,5-T can be used to good advantage for their 

 control. 



Railroads like the highways have a brush problem, which heretofore 

 has been handled almost entirely by mechanical cutting. Like the high- 

 way departments they must give a great deal of consideration to sensitive 

 crops adjoining their right-of-way, but some railroads, especially those 

 running through the eastern mountains, are applying sprays of 2,4-D 

 and 2,4,5-T from on-track equipment with successful results. Roadbed 

 treatment is primarily with herbicides of the soil-sterilant or contact 

 type. 2,4-D has been used for roadbeds in only a few cases where nongrass 

 species predominated. 



The control of water hyacinth in Florida and Louisiana with 2,4-D 

 is a notable example of the success of this compound in solving an old 

 problem. Tremendous sums have been spent in mechanical chopping 

 of water hyacinth in canals. Now airplane application of relatively 

 small amounts per given area are being successfully used. Visitors in 

 south Florida during the past two years have seen visual evidence of 

 the success of this clean-up campaign. Lotus is another emergent aquatic 

 that has been successfully controlled with 2,4-D particularly by the 

 Tennessee Valley Authority as a part of its mosquito-control activities. 



The vegetation-control problems of various industries are so varied 

 that they cannot be discussed individually. Undesirable woody growth 

 and tall-growing herbaceous plants can frequently be brought under 

 control or eradicated on industrial grounds by the proper use of the 

 chlorophenoxyacetic acids. This is also true of the tremendous areas 

 given over to our military establishments. 



The use of 2,4-D for weed control in lawns and recreational turf 

 areas is almost too well known to warrant comment. It is of interest that 

 white clover and other legumes that are sometimes undesirable com- 

 ponents of turf may be more readily killed by 2,4,5-T than by 2,4-D. 

 In this connection the writer has frequently observed a greater response 

 from semiresistant plants, such as white clover, during hot weather than 

 during the cool seasons of the year. 



Poison ivy, one of our most undesirable plants in recreational areas 

 is also more susceptible to 2,4,5-T than to 2,4-D. The difference between 

 these two chemicals is often the difference between a high percentage 

 of eradication and a temporary reduction in top growth. 



