84 B.C. ExTOJtOLor;n'AL SdciKTV. 



In OclnliiT. llii:;, Mr. W. A. Ross, Field Officer of the EDtoniological r.r;iii<-li. 

 coiidiuted ail experiiuriit in a large feed-store at Duiidas. Out., wliieli was badly 

 iufested with the Mediterranean flonr-uioth. Myriads of the moths were present 

 and the meal and flonr in the sacks were literally alive with caterpillars. The 

 heating (System consisted of five steani-pi]ies. wliicli extended half-way around the 

 walls, and four hox stoves. I'ractically lialf of tlie second tloor was occupied by 

 a suite of offices heated by steain-railiat<irs. In tlic miliealcd ])ortion of this flat 

 oue box and two steam-gas stoves liad liecn inslalled. and on Ihe to]) Hat four 

 gas-stoves. 



At p.m. the steam was turned on and the stoves were lighted. At 1 a.m. the 

 moths in the bins on the top tlat commenced to succumb to the heat (114° Fahr.). 

 At 10.30 p.m. the following day no living insects could be found on the second and 

 third flats. The temperature on the tliird tloor had reached 120° F;ihr., and on the 

 second floor 108° Fahi-. in one place and 121 1° Fahr. in another. The thermometers 

 available and used on these floors did not register higher than 120° Fahr. On the 

 first floor five extra stoves were installed owing to the fact that the temperature in 

 the immediate neighbourliood of the floor was not sufficientl.v high to prove fatal. 

 The heating on this floor was begun at a.m. and discontinneil at p.m. Better 

 thermometers were obtained and these registered as high as 147.2°. 120°, and l."iO..S° 

 I'alii-. The one which registered 120° Fahr. w,-is lying on llic Ibmr near a door. Two 

 wcelcs later Mr. Ross again visited the store and no sign of Ihe iiiscci conhl be seen, 

 nor bad an.v been noticed by the owner of I be warehouse or his men since the building 

 w.is superheated. 



One other experiment to which I will refer took place in a large seed-store at 

 A'icloria, B.C. The insects pn'senl in Ibis instance were the two granary-weevlls^ — 

 nauiely. the grain-weevil (Cnliiinhii ijiiniiiiim and the rice-wee'\al (^Calainlra orjixrr). 

 I'.olb wei'vils had been found working fi'ccly in stored grain. Towards the end of 

 April. 11114, we recommended to Ihe prnprielnrs of this store that they ado|it super- 

 heating to destro.v the insects. This they did. Ihe temperature being raised to 

 between 11.5° and 12.")° Fahr. and maintained for aloul I'igbt honrs. with the desired 

 effect. 8teel oil-barrels were used as stoves to i-aisi' Ihe lemperatnre. Holes were 

 imnclieil in these, near the boltom, so as lo prn\iile a ilrangbl. and <-i.l;e was used 

 as a tnel. I'revions In tile snperlieat ing, tiunigalion willi bisulphide of carliru U.ad 

 been tested, the anionnt of l)isuli)liide used being aiiproximatel.v 3% lb. to ever.v 

 1.00(1 iail)i(/ feet of space. The building consisted of four floors, of a size 30 x 110 

 feet, three being 10 I'eet high and one 14 feet high. The liquid was poured into tin 

 \esKels which wci-e distril lUted throughout the building. Tliis fumigation killed large 

 nnniliers of the adults, bnl diil not have an.v effect upon the e.ggs. Consetiuentl.v, 

 later, the superheating melliod was .■idii|)led with enlire satisfaction. 



As mentioned above. Ihe bi'at trnm a high lenipcralnrc of 12.")' Fahr. nuiinlaineit 

 for several honrs penelrales into all (a-acks, etc., killing all stages of the insects 

 present. 



CONTROL OF CABBAGE-APHIS BY PARASITES IN WESTERN CANADA. 



r.Y K. II. Stkkkl.v.M). LKTiiiJKiiHa:, Ai,i;i;kia, I'lia.n ( in u i:ii. ICMO.MoLoiiU ai. I'.ka.nlu, 

 Dominion Department of AGiiicri.TrRE. 



The cabbage-aphis (A/ilii.t hni.isicir T.inn.t. though a native of Europe, is now 

 widely distributed in America, when' il was fii-st rci'dnled in ITPl. In Fletcher's 

 report for i^'.l.") it was stated that .i "grey ai)bis i])i)ssilily 1. Iirasxicir)" had been 

 very destniclive on N'.ini-ouver Island, and that Ihe worsi yi'ar on record was ISTIi. 

 There can be little ilonbt bnl that this note relerred lo .1. hniss!c<r. wliidi has l]een 

 recorded frequeutl.y from this localit.v since that date. It has Ihen-fore been ])resent 

 in British Columbia for at least forty years. 



Very briefly the life-history of this aphis is as follows: The small shining black 

 eggs are laid in the fall on cabbage stumps and leaves. They may be found also on 



