16 



THE GRAPE ROOT-WORM. 



and variations as to the habits of the beetles in order to accomplish 



effective results. 



There are at present 6 species of the genus Fidia known to Boreal 



America and by including 

 those occurring in Central 

 America there are 14 known 

 species . Of these, Fidia viti- 

 cida Walsh and Fidia lon- 

 gipes Melsh. have been re- 

 corded as being injurious to 

 the native varieties of the 

 domesticated grape. Fidia 

 longipes (fig. 3) is found gen- 

 erally throughout the Mis- 

 sissippi Valley and in the 

 Eastern States. It is, how- 

 ever, less common than F. 

 viticida. In Missouri and 

 Kentucky it occurred in in- 

 jurious numbers on the Con- 

 cord and on Norton's Vir- 

 ginia varieties of grapes. 

 The earlier stages of this 

 beetle are not yet known. 

 For characteristic distinction of the species of Fidia reference is 



made to the works of Lefevre, Jacoby, Horn, and S-chseffer, as listed 



in the appended bibliography 



(p. 93). 



BEETLES FREQUENTLY MIS- 

 TAKEN FOR THE GRAPE 

 ROOT-WORM BEETLE. 



There are several different 

 kinds of beetles injurious to the 

 grapevine, and these when found 

 in numbers are frequently mis- 

 taken for the grape root-worm 

 beetles. It is essential that an 

 insect pest should be properly 

 determined before any success- 

 ful control measure can be prop- 

 erly recommended. Although 

 most leaf-eating beetles can 

 be controlled with a poison spray, as used against the grape root- 

 worm, there exists a marked difference in the time of appearance of 



Fig. 3.' 



-The grapevine Fidia {Fidia longipes): Adult or 

 beetle. Much enlarged. (Original.) 



Fig. 4.— The grapevine flea-beetle {Haltica chaly- 

 ftea): Adult. Much enlarged. (Original.) 



