362 Report OF THE~ ENTOMOLOGISTS OF THE 
to make a second application against the larve when they first 
appear on the leaves. In this case use the Paris green at the 
usual strength, 1 pound to 150 gallons. If Bordeaux mixture is 
to be applied the Paris green or other arsenical may be mixed 
with it in the same proportion as with water. 
In combating this insect it should be remembered that prompt 
and thorough work is absolutely necessary to ensure success. The 
spray should be fine enough and so directed as to cover as many 
of the buds as possible and when applied to the leaves both upper 
and under surfaces should be wet. 3 
IMPORTANCE OF UNITED EFFORT. 
The grape vine flea beetle is one of the species which migrates 
readily from one field to another. A neglected vineyard may 
serve as a breeding place for large numbers of the beetles which 
will in time infest other vineyards in the vicinity. This was well 
illustrated last season in several Keuka Lake vineyards which 
came under the writer’s observation. Some of the vineyardists 
who were in the habit of carefully spraying their vines had much 
of their good work undone by the large numbers of beetles which 
came from neglected vineyards nearby where food had become 
scarce. From. this it is evident that if this insect is to be checked 
in communities where they have become abundant, every vine- 
yard should be carefully watched and the vines promptly sprayed 
when the invaders appear. 
