THE WHEAT KUST 



201 



the winter and reproduce itself indefinitely, so that it is 

 probable that^ in many cases, this stage of the fungus is 

 all that is necessary to explain its continued existence. 

 All farme]'s know with what maryelous rapidity 

 wheat rust spreads, if wet weather occurs shortly before 

 harvest. It is a disease for which, as yet. no snccessful 

 remedy has been found. Full knowdedge of its life-his- 

 tory is yet wanting, and. possibly, when more is known, 

 successful preventives may be suggested. Early ripen- 

 ing varieties are less liable to damage than others. The 

 fungus often passes the summer on volunteer wheat, 

 lience this should be destroyed. A discussion of the 

 life-history of the European wheat rust may be found in 

 Vr. G. Smith's "Diseases of Field and Garden Crops" 

 (pp. 14T-20T). The American rust is treated of in Bul- 

 letin Xo. 26. Indian Experiment Station : Bulletin Xo. 

 5, Minnesota Experiment Station : and in various other 

 periodicals. 



