87 



Mr. Sanderson rcpoi'tcd lli;it cn'olim- can l»c used tddi-slroy llcas 

 oil doiiic'slic animals. 



.Mr. .^^iiniMicrs staled that tlirips liad heen I'oiiiid dcsl i-oyiii:,^ cania- 

 tions in i^Teeidionses; also that he had found that imniinu- siil|ihiii' in 

 a house was satisfai'tory tor (dearin^ i1 of Ix'dlmiis. 



.Mr. I'letclier slated tlial in inakinjr the liran mash for desl royiuir 

 (Milworms he mixed oidy enough i'aris yreeii with lh<' bran to make 

 it perceptibly {Jji'een. 



l{(d'en-in}.r lo the best ti-eatment for .i;rasslio|>pers, Mr. (Gillette 

 remai-k(Ml that the Criddlo mi.xture of lior.se droppinj^s, sail, and I'ai'is 

 ijreen had not been very eflfective in Colorado <lurinjj; the past year. 



Mr. I'Mctcher had found this mixture remarkably elVective in ^biiii- 

 toba. 



Mr. \Vilco\ eitod the fact that at a i-eeent meelinu- of the Public 

 Uealtli Association in Washington, I). ('., a discussion ai'ose as to the 

 valiK* of usinix hydrocyanic-acid uas for desti-oyinj^' bediiuj^s. It 

 seeme<l to be the opinion of the nieetinu' that this was a rather dan- 

 »;erous I'emedy, but very elfective. 



Mr. Fell reniarke(l that lie has used a full-strength chariic for lleas 

 in Albany, X. Y., and had accoraplislied {j^ootl results, lb? thout::ht it 

 well to i-eeommend ii-on bedsteads for use in liouses wlier*' bedbu.i;s 

 are present. Durinj; i-ecent years a thrips had injurcMJ onions and 

 lettuce in New \'ork, and CoryfJiucd irrorafn had caused miicli injury 

 to chrysanthemums. It is probable thai this insect usually lives on 

 weeds. One grower sprayed with a mixture of whale-oil soap, using 

 1 pound of soap to !' gallons of water, and repoi-ted good results. 



Mr. Osborn believed that it was now recognized that the thripi(he 

 were, on tin? wliole, destructive and not carnivorous. A few years 

 ago, when he made a statement to this etTect, it was not generally 

 accepted, but subsecpient observations seemed to show that his pre- 

 vious statement was correct. The results of .some studies made in 

 ISS] showed that these insects had injured so per centof tlu^ajiple 

 blossoms under observation, in all cases the ])istils having been eaten. 

 They also injui-e (do\(>i', and liaxc been found working on st i-awbei- 

 ri<'S in Illinois. This year i>lants in greenhouses in ( idumbus, <)liio, 

 had been badly attacdvcd by 11ies<' pests. 



Mr. l-'elt stated that he was able to kill (leas with one fumigation. 

 In Mr. Summer's e.\[»erience a fumigation, using a flonble sli-eiigth, 

 liad been elTeetive against these insects, but he had obtained satis- 

 factory results by burning sulphur. lie considerc<l that great care 

 should be taken to allow a looiii that has been fumigated with hydro- 

 cyanic-acid gas to air thoroughly Ixd'ore enlcring it, as some persons 

 were able to stand only a small amount of the fumes. 



Mr. Fletclier remarked that the sulphur fumes would iti-obably be 

 moi"e elVective to lleas ami their larva- if tlie Moors wcie wet at the 

 lime the fumiuatinii was done. Mr. I"'(dt stated his belief that sul- 



