50 
SOME INSECTS INJURIOUS TO TRUCK CROPS. 
tion may not catch the " fleas." On the other hand, the oil is always 
sufficiently liquid and does not dry. Neither substance injures the 
vine, and, although crude oil is the most satisfactory, the tar does 
very well. 
BANDING WITH TANGLEFOOT. 
It was observed during the season of 1908 and also in 1909 that the 
beetles did not fly or jump upon- the vines, but crawled up the stems. 
This fact suggested the possibility of keeping them down by means of 
a sticky band, and a number of experiments were conducted along 
this line. 
Fig. 13. — Hindoo using tarred hand sledge for capture of hop flea-beetles. (Original.) 
Fearing that the tanglefoot might injure the tender vines if it 
was applied directly to them, cotton was first wound around the 
stems and the tanglefoot smeared over that. The bands were placed 
2 feet from the ground, and all near-by leaves removed to prevent the 
formation of a bridge. Two weeks later the leaves below the bands 
and all of the leaves of unhanded vines were completely riddled by 
the beetle, while the leaves which were above the bands were un- 
touched (fig. 14). 
It was found that the tanglefoot does not injure the epidermal 
tissues and can be applied to the most tender vines. This fact has 
