STATE LAWS ON WEEDS 



379 



ous weeds are common. The purchase of Sudan grass seed from a 

 region where Johnson grass is found is likely to result in the sowing 

 of Johnson grass. These two plants are compared in figure 265. 

 Canada thistles have been introduced in many states through the 

 use of grass seeds purchased from regions where Canada thistle is 



FIG. 265. Young plants of Sudan grass (left), and Johnson grass (right), showing the 

 difference in roots. 'Note the many nodes on the rootstalks of Johnson grass no wonder it 

 is a persistent weed. (U. S. D. A.) 



growing. Dodder is spread through the use of foul alfalfa and 

 clover seed. 



The laws of nearly all the states forbid the growth of noxious 

 weeds on our farms. Certain regulations are made regarding the 

 enforcement of these laws, but too often they are not enforced. 



The laws regarding the spread of weed seeds through the sale 

 of commercial seeds are comparatively well enforced in nearly all 

 the states and Canada. Provision is made for the inspection of 

 samples of seeds and the testing of them for impurities. Dealers 

 are required to furnish statements of purity and freshness. 



