LEGUMINOUS CROPS. 



17 



the leaves of clover plants. They will be fully described 

 under the heading of " Pea Weevils." 



The Clover Eelworms {Tylenchus devastdtrix 

 and Tylenchus Havensteinii, Fig. 4) are one of the causes, 

 if not the cause, of " clover sickness.'' They belong to a 

 group of nematoids or " tliread--worms," known as the 

 Anguillulidae. Drs. J. Kuhn {Biedermann' s Central- 

 blatt fur Agricultur-Chemie, 1882, p. 270), Havenstein, 

 Taschenberg and others in Germany, as well as Mr. 

 Whitehead and Miss Ormerod in this country, consider 

 that " clover sickness " is due to the attacks of eelworms. 



Fig. 4. — Clover " Eelwobms " (enlarged). 

 One of the causes of " clover sickness." 



These eelworms of clover have rather elongated rounded 

 bodies which taper towards each end : they are not divided 

 into segments (like the true worms), and although they 

 are devoid of limbs, they have considerable powers of 

 locomotion. These nematoids are found on and in the 

 leaves and stems, as well as in the roots of clovers. These 

 organisms thrive only in the living portions of plants, 

 where they extract the plant-juices by means of their 

 suckers, thus causing a diseased condition of clover crops. 

 The nematoids of clover are never actually parasitic, 

 although they seriously injure these crops. It is only 



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