PESTS OF THE nop CROP. 



u: 



trouble, and that it would prove the best possible remedy 

 to prevent the spread of or damage by the aphides." 



The L'c'lwonii (lisc'cisc causes sickly )( joking bines 



and cm-lin^^ uf the leaf. The troul^le is due lo a minute 



eelworni, which slits and injures the delicate rootlets. 



The accompanying^ cut (h'i^. 75) is from The Journal of 



tlie Wye A.qricultural Colle^^e for April, 1895. I shows 



the leaves, smaller in size than usual, a under, b upper, 



surface, showini^ characteristic curling of edges and 



FIO. 7G. THREADS OF HYPHAE OF HOP MOLD {SpllCerotheca 



castagnei). 



Siiniiner, or active stage, a, Krect liyjiha, u'iviii^ rise to chains of spores (conidia). 

 b. Free "spore" {ronidiiiin). 



puckering of veins; natural size. II, Cross-section of 

 leaf, enlarged forty times, showing abnormal tissue. 

 Ill, As in II, showing further growth of tissue at side 

 of midrib. IV, Cross-section of root, natural size, and 

 V, lengthwise section, both showing effect of stem- 

 eelworm (Tylcncluis dcT'astafri.v). VI, Hop rootlet with 

 attached females of cclworm (Hctcrodcra scJiachtii), 

 almost natural size. VII, Magnified cross-section of 

 rootlet, showing eelworms at work. VIII, a, female 



