94 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



those secured from the same dilution of lime-sulphur without 

 the addition of copper sulphate. On the other hand wliere 

 the lime-sulphur was used alone no foliage injury was observed 

 and only about 4.5 per cent of the fruit was russeted. On tne 

 copper-lime-sulphur plot severe foliage injury occurred, closely 

 resembling that produced by bordeaux mixture and nearly 

 equal to the amount obtained with "Soluble sulphur." At har- 

 vest time over 57.5 per cent of the fruit was unmerchantable on 

 account of russeting. 



This experience with copper-lime-sulphur farther emphasizes 

 the fact that in apple spraying the results secured in other parts 

 of the country using different varieties, grown in a different 

 climate, may or may not be applicable to local conditions. 



Extra fine sulphur flour as a fungicide for scab: A suspen- 

 sion of finely ground sulphur in water at the rate of 10 pounds 

 in 50 gallons was used as a spray on one plot in 1914 and again 

 in 191 5.* While scab did not develop sufficiently in the or- 

 chards either season to make the test a severe one it is evident 

 from the results that this form of sulphur, used in the manner 

 described, has considerable fungicidal value. As compared 

 with the check the per cent of scabby apples was reduced from 

 about 12.5 per cent to a little over 3 per cent in 1914. In 191 5 

 these figures were 5 per cent and a little over one-half per- 

 cent respectively. 



The fungicidal properties of very finely ground sulphur have 

 recently been well demonstrated by the pathologists of the Cor- 

 nell University Agricultural Experiment Station by means of 

 numerous and extensive experiments in dusting apple trees 

 and various kinds of nursery stock with it mixed with powdered 

 arsenate of lead, also in dusting hops for mildew with sulphur 

 alone. 



There seems to be no particular advantage in using the watery 

 suspension of sulphur as employed experimentally at High- 

 moor. Dusting on the other hand is claimed to have decided 

 advantages, particularly for very high trees and for rough or 

 hilly orchards as the lighter dusting machines can be taken 

 where it would be impossible to go with the heavier spraying 



*The method for making this suspension is described on page 180 

 of Bulletin 240 of this Station. 



