12 MAINE AGRICULTURAL EXPERIMENT STATION. I9I4. 



Start the flower buds it was not sufficiently prolonged to cause 

 the liberation of the spores of the perfect stage of the fungus, 

 which form on the fallen leaves of the season before and which 

 are generally conceded to be the chief source of early spring in- 

 fection. With the very cold period following it may be that 

 these spores were not in a condition to be thrown off till about 

 or shortly before the second spraying. None of the h'mb in- 

 fection by scab like that described later in this bulletin was ob- 

 served in the experimental orchard.. 



Dilution of lime-sulphiir. In T912 the results suggested that 

 a dilution of lime-sulphur 20 per cent stronger than the standard 

 could be used on Ben Davis trees with little more danger of 

 injuring the leaves or russeting the fruit and that the increased 

 efficiency of the spray would more than pay the added cost, 

 particularly where the lime-sulphur concentrate is prepared at 

 home. The results in 1913 have strengthened this position 

 rather than weakened it. While the differences were not so 

 marked as last season when the stronger solution produced 

 about 23 per cent less scabby apples than the standard dilution 

 it will be seen on comparing plots 2 and 3 that the per cent of 

 perfect apples was greater, and the etfjcicncy ni scab control in 

 the case of the stronger solution was almost equal to that of 

 bordeaux mixture. 



Lime-sulphur vs. bordeaux mixture. The continued use in 

 ihis series of experiments of a plot sprayed with bordeaux 

 mixture is solely for the purpose of comparison. The efficiency 

 of bordeaux mixture in controlling apple scab and tl:e almost 

 certain occurrence of foliage injury and fruit russeting from its 

 use on the variety of apples employed in the experiments are 

 well established facts. Such a plot in conjunction with an un- 

 yprayed check is of value as a standard by which to judge the 

 action of the other fungicides in controlling scab or in the pro- 

 duction of spray injury. In 19 12 bordeaux mixture produced 

 a greater percentage of perfect apples than did standard dilu- 

 tion lime-sulphur, but the stronger lime-sulphur produced bet- 

 ter results than either of these. In 1913 almost perfect con- 

 trol of scab on the fruit was obtained from bordeaux mixture 

 but on account of russeting less than 30 per cent of perfect 

 aipples were obtained. On the other hand very efficient control 



