18 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
the buds. The most effectual way of destroying them consists in 
taking advantage of their natural habits, and interposing obstacles 
to their ascent of the trees by surrounding the base of the stems 
with rings of some viscid material, in which they stick and perish. 
Instances might be cited of other eradicative measures of the 
same nature as those already given, but enough has been said to 
indicate the general principles of such measures, and time compels 
us to hasten on to look at the other group. 
Destruction of Insects by means of Lures.—Measuvres of this kind 
are the most easily arranged and supervised, and are, generally 
speaking, the most effectual. They have this point in common, 
namely, that the insects are not actually sought for, but are 
induced to congregate in certain specially arranged places, where 
either they or their eggs, larve, or pup may be easily captured 
and destroyed. 
Pine weevils can be kept down, if not eradicated altogether, by 
laying out spruce or Scots pine logs, upon which the beetles deposit 
their eggs, and these, or rather the larvee which result from them, 
are afterwards destroyed. ‘lhe system succeeds best on ground 
previously stocked with conifers, where, however, the old stools 
have been trenched out. Fresh stems of spruce or pine 3 to 4 
inches in diameter are selected, which are cut into blocks 4 or 5 
feet in length, care being taken to preserve the bark as entire as 
possible. These logs are buried in the ground in the month of 
May, in such a way that the thick end is covered to the depth of a 
foot or so, while the thin end projects above the ground 2 or 3 
inches. The soil and turf are afterwards replaced, and the whole 
firmed somewhat by tramping. About twelve such lures are 
enough for each acre, and in order to facilitate finding them, some 
sort of order should be observed in laying them down, and their 
position should be marked by wooden pins or stakes. In any 
case, such lures are largely made use of for oviposition, and when 
no old stools are present to act as counter-attractions, nearly every 
female pine weevil finds her way thither, and not only weevils, but 
many other destructive insects besides. In the month of October 
the blocks are carefully dug up, and the bark, with the larvee which 
it contains, is stripped off and burned. 
A lure of another kind is largely used in the destruction of pine 
weevils, which attracts the insects not for purposes of oviposition, 
but solely for food. This lure consists of sheets of the bark of the 
spruce or Scots pine of a convenient size, say 15 by 10 inches, 
