692 



The Large Brown Pine Weevil. 



[FEB, 



or June lasts about three weeks, and the beetles issue by a round 

 hole bored through bed cover and bark. 



The adult beetles are long-lived, and Von Oppen has shown 

 that they can live during a season, and after hibernating can 

 proceed anew to pairing and egg-laying. Thus in the early 

 summer different generations of beetles may be found at work, 



(1) some of the egg-laying beetles of the previous year, 

 which, after their hibernation, continue their egg-laying ; 



(2) beetles which had completed their development in the 

 previous autumn but too late to proceed to reproduction ; 

 and (3) beetles newly adult, which having passed the winter as 

 larvae or pupae had developed into the adult in the warmth oi 

 spring or summer. 



The point of great practical importance is that there is no 

 limited swarm period, but that beetles may be found at work 

 feeding and reproducing during all the warm months of the year. 



Preventive and Remedial Measures. — I. Removal from the 

 felled area of stumps and roots, so as to deprive the beetles of 

 breeding places. 



2. The stumps and roots may be left to serve as places for 

 egg-laying, but they must be grubbed up and burnt, so as to' 

 destroy the enclosed brood before development has reached 

 the adult stage. 



3. Avoid having breeding places and feeding places side by 

 side or near one another, i.e. t avoid cutting and planting areas 

 in regular sequence. The longer the time elapsing between 

 felling close to a newly-planted area the better. Much can be 

 said for the practice of allowing stumps and roots which are left 

 in the ground to decay before planting the area. 



4. The making of trenches, to keep the beetles from reaching 

 a newly-felled area for egg-laying, or to isolate a clean area 

 newly planted, is often recommended. The trench, a foot deep 

 and 8 to 10 in. wide, should have steep sides and be clear of 

 rubbish, and the beetles which fall into it must be collected 

 every day and destroyed. Opinions differ as to the value of 

 these trenches. Experience shows that they may easily fail 

 as traps, as the beetles can fly over them. 



5. Branches of pine and spruce a yard long and 2 to 3 in. 

 in diameter thrust into the soil on felling areas, are used by 



