New. York AGRICULTURAL EXPERIMENT STATION. 213 
later. Of the larval channels that were examined, a number of 
the beetles had emerged, some were still in the channel ready to 
escape, and of thirty larvae present in the channels, all but three 
reached the adult stage. 7 
DIRECTIONS FOR PREVENTION OF INJURY AND CON- 
ROTOR BEE EDES: 
From observations that have been made, it is believed that 
planting young blocks of trees adjacent to old plantations facili- 
tates the spread of the beetles, and their injurious work. When- 
ever practicable, young trees should not be grown near old infested 
blocks. When a few trees or a plantation is slightly infested, the 
insect can be effectually controlled by cutting out and burning the 
infested parts in June, before the beetles emerge. The presence of 
the larvae in the wood is indicated by the appearance of sawdust 
and excremental particles, and the exudation of sap at the external 
opening of the larval channel. Also much benefit will be derived 
by destroying by fire all branches and trees broken by the wind or 
otherwise injured, as they are likely to be infested. Plate IX, fig. 3. 
Poplar and willow blocks grown in localities where the beetle 
is abundant-should be sprayed during the last two weeks in July 
with bordeaux mixture, containing three pounds of lead arsenate 
to fifty gallons of the mixture. This is advised experimentally, as 
the tests in the nurseries to determine the value of this treatment ° 
are not as yet completed. The trees should be thoroughly sprayed 
so that all parts of the bark, including that of the small branches, 
are well coated with the poison. 
The total cost of this treatment when applied to two year old 
nursery trees in our experiments, was approximately one-fourth 
of a cent per tree. The experiments indicate that if the treat- 
ment is properly applied it will control the poplar weevil. This 
spray also protects the tree from many other insect and fungus 
enemies. 
If willows or poplars planted for windbreaks, or screens, or 
holders of the soil, should become so badly injured as to impair 
their beauty, it is advisable to dig out and burn the infested trees 
during the winter or spring, and to replant with some other kind 
of atree. For this purpose, Mr. A. H. Kirkland of Massachusetts, 
recommends the silver: maple, Acer dasycarpum, or its variety 
weirit, either of which is said to make a good growth in damp 
localities. 
