jaci^wuKM UALLS 



III 



This eelwprm also attacks Wheat, giving rise to roundish, 

 growths resembling purplish or dark-coloured peppercorns 

 in the ear, but it rarely occurs in sufficient numbers to be a 

 serious pest. Miss Ormerod remarks : " The figures [repro- 

 duced below] give the mass of worms in a cockle gall, and 

 also the worms just escaping from the eggs, all greatly 

 magnified. It is difficult to convey any exact likeness of the 

 wormlet itself at this size on wood, but the figure gives the 

 general shape, and the upper end shows moderately the 

 spear or proboscis in the mouth-end, though not its three- 

 lobed base ; also the rounded muscular swelling just below 



Fig. 29 — WoRMLETs of Tylmchus tritici escaping fkom Eggs. 



Fig. 30 — Section of a Cockle Gall with V/ormlets inside. 



After Bauer's figures. (Much magnified.) 

 Fig. 3: — Spikelet of Wheat with Galls. (Magnified.) 

 Fig. 32 — Tylenchus tritici. Wormlet. (Greatly magnified ; natural 



length about | inch.) 



Reproduced, by permission of Messrs. West, Newman and Co., from 

 Miss Ormerod's "Manual of Injurious Insects." 



which is one of the characteristics of this species, and the 

 coarse fat granules in the intestine. The colour is yellowish- 

 white, and the largest wormlets are from \ to even \ inch 

 in length." Dr. Bastian noted that this eelworm may re- 

 main dormant for twenty-seven years, and again resume its 

 wonted activity ! 



