STEM EELWORM. 
21 
Eelworms leave the plants, and remain in the upper part of the land; 
therefore preventive measures consist first and most importantly in a 
rotation that does not give one kind of crop notably liable to Eelworm 
attack to immediately follow a crop obviously infested. Thus Oats 
should not follow Stem-sick Clover, nor Clover, Tulip-rooted Oats ; and 
now we find that Field Beans require attention as to their powers (as 
a general thing) of taking the infestation. Potatoes also are liable to 
attack of Tylenclius devastatrix , but it has not been as yet reported as 
present here. 
The Eelworms are not necessarily destroyed by processes of digestion, 
so that the very same Eelworms which were taken off the field in 
infested straw, &c., for fodder, may be returned to it in manure. 
Very deep ploughing, or ploughing with a skim-coulter, or (where 
only small patches of a few yards have to be dealt with) trenching so 
as to turn down the top spit, are good mechanical measures of treat¬ 
ment. 
CLOVER. 
Stem Eelworm. Tylenclius devastatrix , Kuhn.* 
Stem Eelworm (Tylenclius 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. Bitzema Bos. 
Only a few observations on Clover Stem-sickness, caused by the 
attack of the Stem Eelworm, have been sent in the past season. From 
* The above wood engraving is merely given to save reference as to general 
appearance. For highly magnified figures of male and female Tylenclius devastatrix , 
together with figure of eggs,and other details, the reader is referred, as before men¬ 
tioned, to plate accompanying paper on “ Tulip-root.” 
