104 



DISEASES OF CEOPS. 



damage to the rye crops of Germany and Holland. The 

 disease known by the names of " knopf," " riib," and 

 "stock," is due to injury caused to rye plants by the 

 above-named nematoids. 



The Wire-worms, already described, seriously in- 

 jure rye plants. 



Fig. 40.— The Erqot op Bye, etc. {Claviceps purpurea). 



A. An ear of rye with ergots (a). 



B. A section tlirough an ergot (in its early condition)'; at 6 is a myoeliom 



bearing conidia ( x 270). 



C. A germinating ergot (a sclerotium), (nat. size). 



The Ergot of Rye {Claviceps purpurea, Figs. 40 

 and 41) is nothing more than a sclerotium or compact 

 hard mycelium of the above-named fungus. The ergots 



