176 THE EEPORT OF THE No. 36 



Mr. Treherne: May I ask a question? Have you tested the effect of sprays 

 like Bordeaux and lime-sulphur in relation to the oil coating on trees? 



Prof. Caesar: We could not make any definite statements in this connection. 



Mr. Sanders : Did you find any variation in the color of the heads of Archips 

 rosaceana ? 



Prof. Caesar : I may say that we laboured under difficulties £is at first we did 

 not know which larva3 were which. I am not sure how much variation there was. 

 This species was rare in the orchard. 



Mr. Petch: In regard to this new pest in the Province of Quebec for three 

 years out of the last four we have not had them at all. Last year they appeared 

 and attacked 75 per cent, of the fruit in some orchards ; this year in the very same 

 orchards after the ordinary spraying there was no injury. We have both species 

 that were mentioned. It seems to me that this pest has, through some climatic con- 

 ditions or through some assistance, come over to our fruit land and, through some 

 other means which I do not know, disappeared. Previously I do not know that it 

 has been recorded in the Province of Quebec as a serious pest. 



Mr. Winn : I think there is some doubt as to where thait species came from. 



Prof. Caesar: I would like to say that there is little doubt that this insect 

 will come under control within a few years. 



Mr. Winn : There are fifteen minutes left to be devoted to questions that may 

 be asked. The meeting is open for general discussion. 



Mr. Treherne : I would like to start the discussion by asking for some in- 

 formation on the latest sprays, like Soluble Sulphur, Blackleaf 40, and the different 

 kinds of oil sprays. 



Mr. Sanders : We had very much experience with Soluble Sulphur this year, 

 but we are not in a position to make any recommendations on this material, 

 although some day we may be able to make a spray of it. 



Dr. Fernald: I have had a little experience with soluble sulphur and I may 

 say that under the conditions in which I used it it did did not prove a good poison. 

 Some experiments made years ago and not published until after they had long been 

 duplicated, beginning first with the analysis of the lime sulphur and determina- 

 tions of the ingredients found in it, show conclusively that the results at that time 

 under those circumstances were obtained with polysulphids and thiosulphate, and 

 *bat when these reduced to sulphite we got absolutely no results whatever. I have 

 •=o>iie hope, however, for soluble sulphur, though I may have nothing whatever to 

 'jase my hope on after all. It is, perhaps, among the possibilities that the Eed 

 Spider may yet prove to be more or less successfully attacked by such a substance as 

 soluble sulphur. It is one of the things! that I hope yet to carry on experiments 

 with. I can only say, therefore, that I am hoping there is something in it, and 

 v.--t I do not know. 



Mr. Sanders : Did you ever have any experience with Barium sulphide. 



Dr. Fernald: Yes. We tried it this year and watched the results carefully 

 all summer on San Jose Scale. The results have been quite satisfactory. The same 

 trees which a year ago last spring were treated with the lime sulphur, and 

 this year with Barium sulphide, were on the whole in better condition than they 

 were a year ago. That does not mean, you will realize, that the treatment was dis- 

 tinctly better than lime sulphur, because there might have been other factors this 

 summer which did not appear a year ago, but if we can get anything like the same 

 results we found it a much more convenient substance to handle. It is much more 

 easily shipped. 



