550 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol.9 



effort to find a control for this pest in nurseries. Although the experi- 

 ments were not on a large enough scale to be conclusive, still the 

 results in some cases were very gratifying. 



Spraying in forest plantings is of course economically impossible, 

 but if an effective material can be found it should prove to be of the 

 greatest value in commercial nurseries and in ornamental plantings. 



Approximately five hundred adult weevils were freed during the 

 early spring in the plots treated in order that a heavy infestation might 

 be insured. 



The results of the experiments are set forth in the following table : 



EXPI;RIMENT8 ON WhITE PiNE WeEVIL 



Material 



Date of 

 Application 



Method of 

 Application 



Strength 



Trees 

 Weeviled 



Kerosene emulsion . . . . 



Creosote emulsion 



Creosote 



Carbolineum 



Creosote 



Carbohneum 



Soluble oulphur 



Lime sulphur 



Scalecide 



Powdered lead arsenate 

 Powdered lead arsenate 

 Paste lead arsenate. . . . 

 Paste lead arsenate. . . . 



Calite 



Calite 



Carbolic emulsion 



Apr. 26, 1910 

 Apr. 13, 1916 

 Apr. 13, 191t 

 Apr. 13, 1916 

 Apr. 13, 1916 

 Apr. 13, 1916 

 Apr. 26, 1916 

 Apr. 26, 1916 

 Apr. 26, 1016 

 May 6, 1916 

 May 6, 1916 

 May 6, 1916 

 May 6, 1916 

 May 6, 1916 

 May 6, 1916 

 Apr. 26, 1916 



Painted 

 Sprayed 

 Painted 

 Painted 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 

 Sprayed 



1 to3 



1 to 2 



Pure 



Pure 



Pure 



Pure 



4 lbs. 100 gal, 



1 to8 

 lto25 



3 lbs. 50 gal. 



2 lbs. 50 gal. 



5 lbs. 50 gal. 

 10 lbs. 50 gal. 



1 to 50 



2 to 50 

 1 to 3 



Check Trees 



The check trees were scattered in groups through the stand and 

 were infested as shown in the above table. 



From the above tables it is evident that none of the materials used 

 proved effective with the exception of the creosote and the carbolineum. 

 Lime-sulphur at scale strength, which has been recommended as a 

 deterrent, in this trial at least, proved valueless. Neither was it 

 found possible to poison the adult weevils with arsenicals, although 

 very strong solutions were used. Since the pine weevil works only 

 on the terminal shoots it is only necessary to apply the spray or wash 

 to that part of the tree. 



