254 



WEED FLORA OF IOWA 



Fig. 145-C. Distribution of Field Dodder. 



It is advisable to mom the patch if it is a small one, to rake the 

 material into a pile, and after allowing it to dry to hum it. The 

 field should he watched carefully, for if the seed is formed, young 

 dodder plants wUl make their appearance upon the new growth of 

 clover. It is hest therefore to follow the mowing hy hoeing if the 

 spot is a small one and continuing this for several weeks until all 

 danger of infection is passed. Dewey recormnends keeping the soU 

 stirred for about two inches and not allowing any young plants to 

 come in contact with the clover. 



Wallace's Farmer suggests the following treatment: "Where 

 our readers find this yellow vine twining around their clover or al- 

 falfa they must act promptly and effectively. If when they dis- 

 cover dodder they will cut it off close to the ground before it seeds 

 no damage will follow, as dodder is an annual. It will not do, how- 

 ever, to trust to the scythe or mower, for the least particle of dod- 

 der which remains attached to the stubble will grow much more 

 certainly than any corn or wheat will grow. Where a whole field 

 is infested perhaps the safest way is to mow it before the dodder 

 goes to seeding, use it for hay, and then plow it up for a crop the 

 next year. Or, if we would rather lose a crop of hay than lose the 

 stand, mow it, let it dry, and burn it, so as to destroy the dodder 

 in the stubble." 



HYDROPHYLLACEAE. WATERLEAF FAMILY. 



The common waterleaf belongs to this family. Eepresentatives 

 of the family are more numerous in the west and south than in the 

 east and north. 



