A Sawfly Injurious to Young Pines. Le 
CONTROL. 
The control of Leconte’s sawfly depends largely upon the extent 
and location of the infestation. In nurseries and parks, when the 
infestation is heavy, a thorough spraying with lead arsenate, 2 
pounds of powdered lead arsenate to 50 gallons of water (or 6 
teaspoonfuls to the gallon), will give good results. Spraying should 
begin when the larve are first discovered. In a scattered infestation, 
hand picking or knocking the larvee from the trees and cgrushing them 
will be found more economical and at least as effective. 
In large areas of either natural or artificial reproduction control 
can not be generally practiced because of its expense; but rangers 
and lumbermen should make it a habit to destroy the colonies of these 
larve whenever found. 
Whenever these insects are observed in any locality and control 
measures are practiced against them, it is important that the terri- 
tory be carefully surveyed for the following 14 months, since it is 
possible that some larve may have escaped the treatment and have 
spun cocoons. This possibility makes watchfulness necessary over 
the entire colony period of the species in order that an emergence 
of adults from these cocoons may not reestablish the infestation. 
WASHINGTON : GOVERNMENT PRINTING OFFICDE : 1822 
