PROCEEDINGS 1917 



81 



from the dark room were burned very badly, those from the half lighted room were also 

 badly burned and those from the full light were burned but slightly. The soluble sul- 

 phur sprayed seedlings from the dark room were burned a little, and those from the half 

 light and full light not at all. The seedlings of all groups sprayed with Bordeaux were 

 notjn any way injured. 



As the complaints from spray injury were first widely noted in 1915 and 1916, and 

 most serious in 1917, the sunshine records for the months of May, June and July for the 

 last several years were looked up at Wolfville and Kentville, N. S., to see if they would 

 show us why the injury from lime sulphur had increased to such an extent. 



No. of Hours of Sunshine per month, Wolfville, N. S. 



May 



June 



July 



Total 



The total hours of sunshine for the same three months at Kentville, N. S. were: 



Total . 



1913 



700 



1914 



1915 



678 



555 



1916 



1917 



551 



473 



It will be seen from the foregoing that the spraying periods, or the months of May, 

 June and July of 1915 and 1916, had approximately 100 hours less sunlight than the 

 years 1913 and 1914, and that the same period for the year 1917 had approximately 200 

 hours less sunshine than the years 1913 and 1914. Or in other words the amount of 

 bright sunshine for the three months 1917 was reduced by almost 30 per cent when com- 

 pared with the years 1913 and 1914. It would seem probable that the amount of sun- 

 shine, affecting the chlorophyll content of the leaves, determines to a great extent the 

 amount of lime sulphur injury. 



P. J. Parrott and W. J. Schoene in Bull. 330 of the N. Y. Agr. Exp. Station, "Ex- 

 periments with Home Made, Concentrated Lime Sulphur Mixtures, Dec. 1910" give 

 the following list of answers in reply to enquiries as to the causes of lime sulphur in- 

 jury in 1910: 



1 "Rapid growth of fruit and foliage." 



2 "Leaves young and tender." 



3 "Too much rain." 



4 "Cold weather and rain." 



5 "Cloudy conditions." 



6 "Lack of sunshine." 



7 "Prolonged cloudy weather." 



8 "Sunshine following showers." 



9 "Excessive use of spraying mixtures." 



10 "Uneven distribution of the spray by worn out nozzles." 



11 "Spraying while dew is on the foliage." 



These answers are quoted and commented upon by V. D. Safro in Research Bulle- 

 tin No. 2, of the Oregon Agr. College Exp. Station, "An Investigation of Lime Sulphur 

 Injury, its Causes and Prevention." 



Of the eleven answers, 5, 6 and 7 place the blame directly on lack of sunshine, 3, 4 

 and 8 on conditions which hint at previous cloudy weather as well as moisture, 1 and 2 



