740 , EXPERIMENTAL FIMIS 



7 GEORGE V, A. 1917 



or one gallon should be diluted to make 37^ gallons of spray. If a concentrate has 

 1-26 specific gravity test and a 1-008 spray is desired you would proceed as follows: 

 (l)-260 



32i gallons of spray, or 1 gallon should be diluted to make 32J gallons of 



(1) -008 



spray. Any reference made as to the dilution in this report is based on the specific 



gravity test of the Grasselli concentrated lime-sulphiir. 



The approximate date of full bloom at the different orchards was as follows : — ■ 



Variety. Bridgetown. Berwick. Falmoutb 



Gravenstein June 4 June 3 June 6 



Golden Russet "6 "8 "10 



Tompkins King "6 " « "8 



Baldwin "9 "8 — 



Blenheim "7 *' S — 



Stark "6 "8 — 



Ben Davis "10 "10 — 



Ribston "6 "6 "8 



Roxbury Russet (Nonpareil) . . " - 8 ' — 



Northern Spy "10 "10 "12 



The dates of application have varied somewhat at the different orchards, but 

 in all comparative tests the sprays were applied on the same days. In the majority 

 of the tests two sprays were put on before the blossoms and two after. 



It is interesting to note that from the 15th May when first spraying work at 

 Berwick started there was more or less sunshine every day to the end of the month 

 except on the 16th, 18th, 22nd, and 28th. Eain fell the 15th, 16th, 18th, 19th, 22nd, 

 2.3rd, 24th, 27th, and 29th, the total precipitation however was only 0-85 inch, of 

 which 0-42 fell on the nights of the 19th and 27th. It wiU be seen, therefore, that 

 the weather to June 1, was fairly favourable for scab development. From the 1st 

 to the 6th June, inclusive, the weather was unusually bright and unfavourable for 

 scab development and favourable for blossoming. This was followed by dark weather 

 on the 10th and 11th. Rain fell on four days following the 8th, which amounted 

 to 1-01 inches, over half of which fell on the 9th, when the blossoms were at their 

 best, after which they soon disappeared. It will be seen that the time during the 

 latter part of the blooming period was particularly favourable for scab development. 

 The next two weeks following the 11th June was* more or less dark, with rain on 

 eight days. 



It will be noticed that the greatest foliage injury occurred when rain and dark 

 weather followed the application of the spray, and also that the soluble sulphur plots 

 showing the greatest per cent scab were those which had a rather sharp fall of rain 

 the day following the application which would seem to indicate that soluble sulphur 

 is less adhesive than lime sulphur. 



The orchards used are fairly well matured and three trees have been used to 

 each experiment. The aim has been to make comparative tests with trees which have 

 been developed under appai'eiltly similar conditions and adjoining each other, and 

 for this reason there may be some difference in the results from the same spray on 

 the different series of plots. In every case the product of the plot has been carefully 

 sorted and the percentage of slight, medium, and bad scab obtained. In many cases 

 the per cent of scab was only slight, which fact is not shown in the total per cent 

 here given. It has been noticed that plots adjoining the check plots often show a 

 decidedly high per cent of scab, and this is what we might expect. Plots for a check, 

 however, left unsprayed are necessary in order to check up the work. 



Kextville. 



