EXPERIMENT STATION WOBK, LI. 15 



is also referred to bulletins dealing with insect enemies of trees, tree 

 planting on rural grounds, 6 and beautifying the home grounds. 



The literature on the subject of shade-tree protection will be of the 

 most value when it serves as a means for preventing rather than 

 curing injuries. By far the greater part of the injuries from which 

 trees suffer can be prevented. When once inflicted, however, it is 

 often very difficult or even impossible to remedy them adequately. 

 In many cases the existing laws are quite sufficient to give all the 

 protection desired. The people should know the laws, and have in- 

 terest enough in the preservation of trees to insist that they shall be 

 obeyed. The most successful plan for cities and large towns seems 

 to be to place the care of street trees directly in charge of a commis- 

 sion or park board empowered by special ordinances to carry out 

 its plans. This gives opportunity for a systematic development of 

 tree culture throughout the entire community and makes it possible 

 to employ experts to direct the work. Similar arrangements can also 

 be adopted in smaller communities with such changes as are neces- 

 sary to suit local conditions. 



SPRAYING FOE WEEDS." 



The eradication of weeds by other than cultural methods has been 

 a subject of study at a number of the agricultural experiment sta- 

 tions and elsewhere. This has resulted in the discovery that various 

 chemicals through their corrosive or other action will destroy many 

 kinds of weeds. As long ago as 1895 it was shown by the Vermont 

 Station that the orange hawkweed, a pest in lawns and pastures, 

 could be controlled by sowing salt over the lawns at the rate of about 

 3,000 pounds per acre without injury to the grass. Lime, salt, 

 arsenite of soda, gasoline, kerosene, crude carbolic acid, and copper 

 sulphate have all been recommended for destroying weeds in drives, 

 walks, tennis courts, and other places where it is desired to keep 

 down all plant growth. Where cultivated plants are grown, thorough 

 tillage can be relied upon to keep down weeds, but the serious prob- 

 lem of eradicating weeds in grain fields, pastures, and large lawns 

 is the one to which present consideration is given. For this purpose, 

 whatever materials are used they must not be seriously injurious to 



U. S. Dept. Agr., Farmers' Bui. 99 ; 296, p. 19. 



6 U. S. Dept. Agr., Farmers' Bui. 134. 



C U. S. Dept. Agr., Farmers' Bui. 185. 



d Compiled from Minnesota Sta. Bui. 95; North Dakota Sta. Bui. 80; Rpt 

 1907, p. 76; Rhode Island Sta. Rpt. 1906, p. 159; Vermont Sta. Rpt. 1895, p. 

 115 ; Wisconsin Sta. Rpt. 1906, p. 259. See also U. S. Dept Agr., Farmers' Buls. 

 .124, p. 19, and 296, p. 10. 

 360 



