44 PROTECTION OF PLANTS, .1916-17 



Percentage of russeting when Bordeaux was used. 



Immediately before the blossoms 7 per cent russeted. 



Immediately after the blossoms 43.6 per cent russeted. 



Two weeks after the blossoms 3 per cent russeted. 



These figures show that the greatest damage comes from the use of 

 strong lime sulphur two weeks or more after the blossoms and it also shows 

 that Bordeaux used two weeks after the blossoms is harmless in so far as 

 removing the set of fruit is concerned. 



It has been always an open question as to what causes the russeting 

 of the fruit when we use Bordeaux, and it appears from what Mr. U. P. 

 Hedrick (Bulletin No. 28, New York Exp. Station) says that "From the 

 study of the matter at this station it does not seem possible that Bordeaux 

 injury occurs on apples after the hairs have been shed, the stomata changed 

 to lenticels and the waxy coating formed." Mr. Sanders claims that Bor- 

 deaux will cause less injury than any other equally efficient spray when used 

 two weeks after the blossoms fall. It is not recommended to use it for the 

 two first sprays at least. 



In the face of this evidence, I am asking why some of our fruit growers, 

 at least those OAvning our Demonstration orchards in this Province, should 

 nottryournew schedule of spraying, it being in itself as economical as possible. 



Spraying Recommendations: 

 No dormant spray against scab. 



1st spray for scab and insects: When each individual bud is showing 

 pink and petals-are separated: Lime Sulphur, 1.007 s.d. and 2 lbs. 

 of arsenate of lime to 100 gallons of water. 



2nd spray. — Immediately after blossoms fall: Lime Sulphur, 1.006 s.d. 

 and add \]/2 lbs. of arsenate of lime to 100 gallons of water. 



3rd spray. — First choice: Bordeaux, 7-7-100, with arsenate of lead or 

 arsenate of lime as a poison, or, Second choice: Two to three 

 weeks later, apply Lime Sulphur, 1.005 s.d. and add 1 lb. only of 

 arsenate of lime to 100 gallons of water. 



N.B. — In wet seasons it may be necessary to spray twice before the 

 blossoms and then I would advise the same spray as for the first one marked 

 above. All spra3's made after the last one recommended here should be 

 alike. 



aft 



