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- 
eral^ 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, Jacob}', Horn, and Schseffer, 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- 
bea): Adult. Much enlarged. (Original.) 
