EXTERMINATION OF WEEDS 93 



disked and harrowed. It will then be ready to be 

 planted in corn, which should be followed by harrowing, 

 and cultivation should then begin as soon as possible. 

 This will keep all of the annual weeds down. By the 

 time the corn is ready to be put by, there will be no 

 weeds. Where quack grass occurs, plowing in the fall 

 should be at least nine or ten inches deep. 



Treatment for Garden Weeds. The annual weeds are 

 easily destroyed by giving thorough cultivation ; the 

 perennial are less readily subdued. In the case of nimble 

 will, the "roots" should be exposed to the sun, being 

 killed after a few days of drying. Where quack grass 

 appears, the roots should be removed and the ground 

 given shallow cultivation. As roots appear they should 

 be cut off each week until the close of the season. Occa- 

 sionally this method is not sufficient; then it is advisable 

 to cover the patch with tarred paper allowing it to re- 

 main for six months. 



Weeds of the Roadsides. Many of these weeds are an- 

 nuals, and by mowing them at the beginning of the flow- 

 ering 1 season, may be destroyed. If they reappear they 

 should be mowed again, and, if possible, clover and grass 

 should be induced to grow in place of the weeds, where 

 they will undoubtedly thrive. The roadsides on the clay 

 soil of northeastern Iowa contain comparatively few weeds, 

 clover and blue grass occupying the vacant places. The 

 same conditions may be brought about in many other 

 sections of the country. Some states, notably Iowa, have 

 passed a law that roadside weeds must be cut early in 

 the summer, but the law is often violated. 



Treatment for Weeds in Yards. These weeds in most 

 cases are annuals and can easily be destroyed by cutting 

 them off at the time of flowering. Generally, this will 

 suffice. In many cases the seeds are allowed to mature. 

 This should be prevented. Use iron sulphate as a spray. 



Summer Fallow. The summer fallow is much em- 



