QUACK GKABS. 245 



6. Divide the infested area into two or three fields. 

 Grow on these for forage such crops as winter rye, bar- 

 ley and oats sown together, rape or kale and corn or 

 sorghnni; not fewer than two of these crops are to be 

 grown in succession each season. These are to be 

 grazed off by sheep, alternating the grazing in the dif- 

 ferent fields, and the process is to be continued as long 

 as may be necessary. 



7. Small patches may be virtually destroyed by en- 

 closing swine on them and leaving them until they have 

 consumed the roots, of which they are fond. 



Methods 1, 2 and 3 can best be pursued in areas 

 where corn is a leading crop, but, where it is not, field 

 roots may be substituted for corn. Method 4 can be best 

 adopted in prairie areas north of parallel 45 where bar- 

 ley can be successfully grown where sown thus late. 



Ohservations. — 1. Quack grass has been destroyed in 

 some soils by one ploughing if done just at the setting in 

 of a prolonged summer drought. The furrows should be 

 narrow and left on edge as much as possible and not 

 disturbed subsequently with the harrow or other im- 

 plement until the grass dies through want of moisture. 



2. In seasons of much rainfall it is virtually impos- 

 sible to destroy quack grass without excessive labor, as 

 at such times stirring the soil usually encourages the 

 growth of the grass. 



3. Whatever method of eradication may be adopted, 

 it is usually necessary to dig out stray plants with a 

 pronged fork in order to complete the work. With this 

 object in view, such a fork should be carried in some 



