DIVISION OF HORTICULTURE 



595 



SESSIONAL PAPER No. 16 



at certain times. It would appear from results obtained that there is no advant- 

 age in doing so. In every case a decided russeting of the fruit with considerable 

 foliage injury accompanied the use of Bordeaux. 



BORDEAUX 3-3-40 vs. BORDEAUX 4-4-40. 



To determine whether a wealier strength of Bordeaux would give less russeting 

 and prove effective in controlling the apple scab, tests were made of a mixture made 

 from 3 pounds copper sulphate, 3 pounds lime, and 40 gallons water, compared with 

 the usual one made from 4 pounds copper sulphate, 4 pounds lime and 40 gallons 

 water. 



It was found that the weaker strength did not materially lessen the russet on 

 the fruit and was less effective in the control of scab where the variety Gravenstein 

 was used, as is shown in the following table: — 



The per cent of russet was less with the weaker mixture in the Ben Davis under a 

 similar test, but the scab was not controlled so well. 



Bordeaux, 3-3-40. 

 Bordeaux, 4-4-40. 



p.c. Russet 

 medium. 



41-96 

 42-32 



p.c. Russet 

 bad. 



21-01 

 27-66 



p.c. Scab, 

 slight. 



23-77 

 10-14 



On a Ribston block in the Fahnouth orchard tlie Bordeaux 3-3-40 gave 10-33 

 per cent slightly scabbed and 36-32 per cent russeted as against 2-85 per cent slightly 

 scabbed and 81-25 per oent russeted in the 4-4-40 Bordeaux, 



THE RELATIVE EFFECT OF DIFFERENT BRANDS OF ARSENATE OF LEAD IN CAUSING FOLIAGE 



INJURY. 



To determine whether some brands of arsenate of lead cause less injury to the 

 foliage than others when used in combination with lime-sulphur, a series, of tests were 

 conducted by using two brands of English lead and Sherwin-Williams and Swift's 

 lead with lime-sulphur, 1 gallon Niagara brand concentrate lime sulphur to 40 gallons 

 water and duplicating the t«sts with 1 gallon to 30 of water. 



The claim is made that certain brands of arsenate of lead are less liable to cause 

 injury from arsenical burning after application. The Sherwin-Williams arsenate of 

 lead, which is a neutral lead, is claimed to be safer on this account than those leads 

 made by the acid process. That there is a difference in regard to possible injury from 

 different makes is evident from data given below. 



A comparison between Sherwin-Williams and Swift's arsenate (the two brands 

 used very extensively in the valley) shows little if any difference as regards foliage 



Kentville. 



