I'if(»i:Ki)i.\i;s. l!)I(i. 83 



were sold tii Im-il ,;;rn\vrrs on \';inciniv('r Island. I'm- tlu' |iasl Iwn years llie nursery 

 lias ceasi'd l<i cxisl. and llir iiwncr is at pri'scnl nn military service in lOureiie. Tlie 

 I (inks el' Ihi' ceniiiany. llierelnre, are eliised and \vi' are mil alile (n .ililain tlie names 

 nf iinn-iiasers. 



Tlie iiniinrlanee nf lliis ndte is well nndersi.Mid ii\ iliose wlm liave experienced 

 ils rava'_'es in 1-Jmland; ennse(|nenl ly pi'dUipl and ellieieiil sleps are nr^'enlly I'eipiired 

 Pi slam]i il (inl. Cmwers nf enrranis ai-e ad\ised to i-eport ils presem-e |o Mie 

 (eiveriunenl if llieir suspicions a I'e aroused. .Vll'ecled IimsIm'S are most easily 

 olisin-ved in llie early sprimr. wlii'n llie Imds of sucli Imslies swell almormally. 

 evenlnally dropping' off or sellinL; no frnil. The only i-emedy adviseil in eoiisidei'- 

 alien of llie present slaiiis of the currant industry of tlie Island is to destroy afCeeted 

 liiislies liy liurnin.i,'. 



SUPERHEATING .« S A CONTROL METHOD FOR INSECTS WHICH INFEST 

 STORED PRODUCTS. 



T'.v .\kiiiih (liiiso.N, ('mil .Vssisi \.\t l-^NToMoi.ocisr. 1 ii i'.\ni .\ii;.\T or AiiuKri.TiKi;. 



<)TT.\WA. 



Tliei'e are se\eral iinportaiil insects wliicli collecl i\ely are resiioiisilile every year 

 for serious losses to Hour, stored LTraiii. etc.. in various parts of Canada, such losses 

 aiiionniin^' to maii.\ thousands of dollars. The .\re(literraueau tlour-iuotli (/v'/i/ir.v/ii; 

 l.-iD'Iniiillii ) is lar:^el\ a Hour inseil. Iinl il also w.irks in other luauufaetured foods. 

 The Indian-meal moth {/■Inilla iiitiriiiiiK'trlUt \ has a wide i-aii.§e of food, attacking, 

 freely. Lrrain and other seeds, meal, dried fruits, nuts. etc. The meal snoiit-motli 

 tl'iiKilis fiiiiii'ili>> is some years found causing' consideralile iu,iur.y to stored .i;raiu. 

 etc. The .Vimoiiiiiois -rain-moth { sitnl I'mKi ii-niili lUi ) is occasionally foiiml ill sliip- 

 nieiils of corn-seed iiniiorled from forei:.'ii countries. Thi' |iii\ver of ^'r.iiiar.N-weevils 

 .Hid similar sm.-ill I eetles to (U'stroy .urain ami otlier stored ]iroducts when held for 

 any leiii;lli of time ill stores or warehouses is euoruious. Tlie weevils which cause 

 tile ^.'reatest daiii:if;e are tile ixra ill-weevil {('(ilidnlid iiniiiiniin and tli<' rice-weevil 

 [CiilaiiiJni o///:,rl. In addition to these wei-vils there are several small reddisli- 

 l-riiwii leetles which comnioii I \ infest stored -rain and mill products. I'.reakfasI 

 foods. Hour. meal, dried fruits, mils. etc.. .ire .-ill .-iltacked. 



Keceiilly the laitomolo-ii .il r.r.incli has had o]iporlunit ies of e.xperimeiit iii^' with 

 liiudi temper.-itures for llie eoiitrol of insecis infcsliiiL: mills and warehouses, and 

 the results ohlaiiied have heeii lii::hly satisfactory. In the siiiierheatin.s melliod of 

 control it is necessary to iiislall a system of lie.itinu' which will give and luainlain 

 .•I temiieratiire of from lUP !o li'.'i Falir. for ahoul six hours. In stores or ware- 

 hiiiises llie eslahlished heat in;: system will reiiuin' to lie aiimiiented liy coal. wood, 

 or :.Ms stoves, particularl.v in autuiun and durinj; the colder luouths. .V iiuuilier of 

 tloiir-inills in the T'uited States which are heated by steam have installed additional 

 r.-idi.-it ion al a cost not exceedin.i; the ex]ieiise of one fuiiii;:atiou with hydrocyanic- 

 ai-id ;.'as. which lias I ecu used lo such an extent in the past for deslroyiu.i; insecis 

 iiifestin;; Hour and oilier stori'd products. The additional system of radialioii is 



lieriiiaiient. and one .iiiiilic.i I i I' the superheat iu-' method each year has lieen found 



111 he siitlicieiil lo imitrol such insects. In Canada, also, llie siiperhea t iiii; melliod 

 has I ecu adopted ill tloiir-mills lo control the .Meiliterranean Hour-moth. In the 

 M unreal district, for instance, the Hour-mills are re.milarl.v. e.-icli suuimer. siih.ieeted 

 to lii;,'li tem]ieraliires to destroy this insect. In instances where luills and w.arehouscs 

 h.ave lieen infested with such sni.all heelles as tlii> eonfused Hoiir-heet le [T lihdliiiiii 

 i-iinfiixinin. and fuiiii;.'aled with li.\ (Irocyaiiic-aeid L'as. il has lieen found that the -as 

 did not |ieiietr:iti> sullicieiitly deep inio all cracks, etc.. to kill the iiisecl ill every 

 sta^e. 'I'lie superheating' iiielhod. liowe\er. reaches the places iiiaccessilil(> to L'as 

 and destroys any insects which may ln' preseiil. 



'J'he followini; hrief st.alemenl w ill indicate the value of lii;.di temperatures as a 

 ciiiilrol measure for such insecis as I have mentioned: — 



