" KAR-COCKLK " EELWORM. 



47 



very likely go through its changes to moth state and cause new 

 mischief. It has been advised to cut off all ends of old shoots which 

 show a perforation, but in the light of later observations it does not 

 seem likely that these stumps should be used for egg-laying, as the 

 larva would not be supplied with soft pith for food, nor would it be 

 able to form its tunnel up and down in the customary manner. It has 

 also been suggested (where the moths are numerous) that they may be 

 captured and destroyed in the cool of the morning when sluggish ; but 

 for ordinary purposes the most practicable method of prevention 

 appears to be (so far as is possible) destroying the tunnelled shoots, 

 and where attack was very prevalent, it might be found that a manager, 

 or some one interested, would learn by glancing along the shoots to 

 distinguish by the condition of the bud, near which the entrance hole 

 had been made, or possibly by the perforation itself being observable, 

 which were the maggot infested shoots. 



EELWOKMS. 



"Ear-cockle" Eelworm. Tylenchus triiici, Bastiskn ; Vibrio triticl, 

 Bauer. Stem Eelworm. Tyhnchus derastatrix, Kuhn. Root- 

 knot Eelworm. Anguillula radicicola ;= Heterodera radicicola, 

 Greef. ; Heterodera radicicola, Miiller. Beet Eelworm. Hete- 

 rodern schachtii, Schmidt. 



Stem Eelworm (Tylenchns devastatrix) ; anterior portion of female showing 

 mouth-spear ; and embryo in egg ; all greatly magnified (anterior portion mag. 

 440 times). From figures by Dr. J. Ritzema Bos.* 



* The above wood engraving is merely given to save reference as to general 

 appearance. For highly magnified figures of male and female Tijlenchus devastatrix, 

 together with figure of eggs and other details, the reader is referred to plate accom- 

 panying of highly magnified figures given by permission of Dr, J. Eitzema Bos, 



