NOTES ON THE NATURAL CONTROL OF OYSTER- SHELL SCALE. 191 



Analysis of Oyster-shell Scale- Eggs, laid in 1916, examined for Hemisarcoptes.* 







i 





t3 



IB 

 4-3 



















O 





+3 P< 



."£ ft 









Date 



By whom 



03 



O 2 



Scales 



£§ 





Host eggs 



Locality 





collected 



collected 



§ S 



£ 



examined 



m c3 



a; w 



£ a 



13 "3 



o a 



1 W 



destroyed 



Moncton 



N.B. 



Oct.& Nov. 



W. N. Keenan 



10 



1400 



10 



1362 



90%-95% 



Chatham 



N.B. 



Nov. 



G. P. Walker . . 



3 



300 















Woodstock . . 



N.B. 



Mar. 



G-. P. Walker . . 



1 



100 



1 



37 



35% 



Kingsclear . . 



N.B. 



Mar. 



G. P. Walker . . 



2 



200 



2 



129 



60% 



Fredericton. . 



N.B. 



Oct.& Nov. 



J. D. Tothill . . 



21 



1600 



17 



483 



15%-20% 



Chipman 



N.B. 



Nov. 



A. B. Baird . . 



5 



250 















Nerepis 



N.B. 



Nov. 



G. P. Walker . . 



3 



100 



1 



21 



5% 



St. Stephen . . 



N.B. 



Nov. 



G P. Walker . . 



4 



250 



1 



53 



5% 



Truro 



N.S. 



Mar. 



W. H. Brittain 



5 



24 



1 



6 



1% 



Halifax 



N.S. 



Mar. 



F. C. Gilliatt . . 



5* 



36 















Kentville . . 



N.S. 



Mar. 



F. C. Gilliatt . . 



6t 



245 















Middleton . . 



N.S. 



Mar. 



F. C. Gilliatt . . 



5 



435 



4 



173 



35% 



Annapolis . . 



N.S. 



Feb. 



F. C. Gilliatt . . 



5t 



230 



4 



80 



25% 



Meteghan . . 



N.S. 



Mar. 



F. C. Gilliatt . . 



5 



475 



5 



250 



55% 



Weymouth 



N.S. 



Mar. 



F. C. Gilliatt . . 



5 



425 



5 



241 



50% 



Yarmouth . . 



N.S. 



Mar. 



F. C. Gilliatt . . 



5 



500 



5 



319 



55% 



Montague . . 



P.E.I. 



Dec. 



M. H. Coughlan 



5 



100 



1 



20 



15% 



O'Leary 



P.E.I. 



Dec. 



M. H.'Coughlan 



6 



32 



1 



5 



2% 



Stanstead . . 



P.Q. 



Nov. 



C. E. Petch . . 



13 



1300 



3 



132 



3% 



Huntingdon . 



P.Q. 



Nov. 



L. S. McLaine . 



5 



500 



5 



466 



90%-95% 



Mount Royal 



P.Q. 



Nov. 



A. B. Baird . . 



10 



1000 



7 



150 



10% 



Ottawa 1 



Ont. 



Nov. 



A. B. Baird . . 



5 



500 



2 



8 



5% 



Ottawa 2 . . 



Ont. 



Nov. 



A. B. Baird . . 



4 



400 



4 



326 



50% 



Guelph 



Ont. 



Nov. 



A. B. Baird . . 



10 



1000 



4 



27 



1% 



Kaslo 



B.C. 



Feb. 



J. W. Cockle . . 



1 



46 















Grand Forks 



B.C. 



Dec. 



E. C. Hunt . . 



4 



650 















Vernon 



B.C. 



Mar. 



M.H. Ruhmann 



4 



500 















Lillooet 



B.C. 



Dec. 



A. W. A. Phair 



2 



100 















Agassiz 



B.C. 



Dec. 



R. C. Treheme 



5 



500 















Harrison 



B.C. 



Feb. 



T. Wilson 



1 



400 















N. Nicoamen 



B.C. 



Jan. 



T. Wilson 



2 



515 















N. Vancouver 



B.C. 



Dec. 



T. Wilson 



2 



355 















Kuper Island 



B.C. 



Mar. 



T. Wilson 



1 



200 















Indian Reserve B.C. 



Mar. 



T. Wilson 



1 



300 















Victoria 



B.C 



Jan. 



E. W. White . 



4 



1700 















Alberni 



B.C 



Feb. 



T. Wilson 



2 



500 















Duncan 



B.C 



Mar. 



T. Wilson 



1 



110 















Ithaca 



N.Y 



April 



R. Matheson . 



4 



550 

















181 



17839 



83 



4288 







* Ve 



ry lightly in 



fested. 





fSpra 



ye& t 



rees. 





This table shows the importance of the mite Hemisarcoptes as a controlling factor of 

 the oyster-shell scale in places where the insect is abundant. It also indicates that the 

 mite has not apparently yet found its way into British Columbia. 



* Reproduced from Agric. Gaz. Canada, March 1918. 



