39 



Owinj; 1() the practice of iiui'scryiucii of ol)tiiiiiini; tlieir lnuls, cut- 

 tings, iind grafts fi-oiii many diirci-ciit sources and to the fact that 

 several recent cases of nursery in i'est at ion can I»e traced dii-ecllyto 

 the use of infested buds, all growers should he iiiged to fumigate all 

 stock of this character before it is used in the nursery. 



Mr. l.ochhead said Ihat t lie ([ncsl ion liad Ix'cii iviiscd in Ontario as 

 to the relative nu'rits of fumigating hud sticks oi- dipping them in 

 whale oil soap mixture, but as the law in that pi-ovince i-equired 

 fumigation lie had not allowed the dipi)ing method to be practiced as 

 a substitute. Tlie standard foi-mula was used in Ontario for fumi- 

 gating nui-sery stock and had proved very satisfactory, viz, 1 ounce 

 of potassium cyanide (1)8 per cent pure), 1 fluid ounce commercial 

 sulphuric acid, and -3 fluid ounces of water to each 100 cubic feet of 

 space, with an exposure of about forty-five minutes. 



Mv. (Gillette mentioned the fact that the fumigation of all nui-sery 

 stock entering Colorado might be required in the future, and ([ueried 

 as to the best formula to use. 



Mr. ]5urgess stated that the formula recommended ])y the Divi- 

 sion of Entomology, at Washington, and used in Canada, nuMitioned 

 by Mr. Lochhead, had been used in Oliio with good results. He fur- 

 ther stated that he had presented a pa[)er coiu'ei-ning this matter at 

 the last annual meeting of the horticultural inspectors at Washing- 

 ton, I). ('., in November, l!»o:5, and that the matter of a uniform 

 foiinula ha<l been discussed. The one decided upon for genei-al use 

 dill'ci'i'd slightly from the one already nu'utioned, the amount of sul- 

 pliiiiic acid and of water being increased 1 ounce each for every 100 

 cubic feet of space. Tufort unately, the length of time for exposing 

 tlie stock was not mentioned, and latci- it was ascertained that tlie 

 jn-actice of those who already used this foiinula varied from an expo- 

 sure of thirty to sixty minutes. It would seem desirable to have a 

 definite length of tinu' for exi)osure before a(loi)ting a unifoi-m f<»rniula. 



Mr. Fletclier said that all nursery stock imi)orted into Canada was 

 fumigated by government officials, and that the results Inul been very 

 satisfactory. No living scales had ever been fouinl after the stock 

 had been fumigated, ami no trees had been known to be in,jure<l l)y 

 I Ills ])i-ocess. In case the trees were carelessly handled, or allowed to 

 remain with the roots exposed, tliey were sonu'times damaged, but 

 this could not be charged to the fumigation. No bad results had 

 been repoi-ted where three times the normal strength of gas had been 

 used. The local nurseries in Canada are re(|nired to fumigate their 

 sfoek at the expense of the owner; the government pays the expense 

 of fumigating at the poiMs of eiit ry. 



.Mr. .Martin (| ueried as to the value of lyr as an insrci icidi- for t reat- 

 iiig l)ud st icks. 



