88 Farmers’ Bulletin 1220. 
CONTROL. 
The presence of honeydew on grapes at harvest time is usually 
proof of mealybug infestation, though the insects themselves may be 
so well hidden within the grape cluster as to escape ready detection. 
Honeydewed fruit should be excluded from the pack and promptly 
removed from the vicinity of the packing house, along with other 
cull grapes. Grape pickers should be instructed to exclude from the 
picking boxes bunches of grapes showing honeydew. Care should be 
taken to disinfect picking boxes by submerging them in hot water, 
| by fumigation, or otherwise. The de- 
struction of the insects in the vine- 
yards offers difficulties. It is under 
investigation at the present time by 
the Bureau of Entomology and it is 
hoped that soon a practical control 
will be determined. 
THE GRAPE CANE-BORER.” 
The presence of the grape cane- 
borer in vineyards is usually first dis- 
closed by the sudden wilting or 
breaking off of shoots in the spring. 
An examination of the canes will 
show a round hole opening into a bur- 
row in the main stem (fig. 39, injury 
‘to pecan), in which will usually be 
found a cylindrical brown beetle about 
three-eighths of an inch long, with 
head set well under the body and the 
posterior end abruptly cut off and 
bearing a pair of horn-like protuber- 
ances (fig. 40). The beetle attacks a 
variety of fruit trees, including apple, 
. pear, peach, plum, pecan, and certain 
Grape cane-borer and its forest and shade: trees, but is most 
troublesome to the grape. The species 
is generally distributed in the United States and Canada east of the 
Rockies, but is most complained of'in certain Mississippi Valley States, 
as Arkansas, Missouri, Texas, Iowa, Kansas, and Nebraska. On the 
Pacific Coast a related form occurs, working in about the same way. 
Injuries by this species are due to the apparently malicious borings 
of the adult beetle in grape canes, resulting in the wilting or dying 
of adjacent shoots, since the grubs breed in drying wood of shade 
and fruit trees, drying grape canes, or exposed roots of maple, etc. 
Fic. 39. 
injury to pecan. Wnlarged. 
22 Schistocerus hamatus Fab. 
