90 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



to each 50 gallons of water. This program has been followed 

 experimentally for two seasons. For the first application 3-3-50 

 bordeaux mixture and lime-sulphur 20 per cent stronger than 

 standard dilution have been used. 



The crop in each case has been very free from scab but on 

 account of the fact that the omission of the first application of 

 standard dilution lime-sulphur on other plots during the same 

 seasons failed to show an increase of scab it is impossible to 

 draw definite conclusions regarding the chief object in view. 

 However all evidence obtained tends to confirm the results 

 secured where arsenate of lead was used alone during these 

 and previous years. 



One important conclusion has been reached. It is evident 

 that bordeaux mixture cannot be used at Highmoor on the Ben 

 Davis, even for the first application when the leaves are be-* 

 ginning to unfold and the blossom buds are not yet open. With 

 it, used in this way, more or less leaf injury has been obtained 

 each season. What seems harder to explain is that a single ap- 

 plication of bordeaux mixture, made before the fruit buds 

 opened has led to a considerable increase in the russeting of 

 the fruit formed considerably later. This increase in russet- 

 ing amounted to nearly 15 per cent in 1914, and about 9 per 

 cent in 1915. In 1914 this plot adjoined one sprayed 3 times 

 with bordeaux mixture and it was thought that the increase in 

 russeting might possibly be the result of the spray drifting 

 across from the latter. A relocation of the plots in 191 5 pre- 

 vented such a possibility. 



No such difficulties were experienced where lime-sulphur, 

 20 per cent stronger than standard dilution, was used for the 

 first foliage spray, but as will be mentioned later an applica- 

 tion of dormant strength lime-sulphur somewhat earlier, but 

 after the leaf buds had begun to open did produce similar 

 effects in a marked degree. 



Dormant sprays for insects as affecting scab control: Cer- 

 tain observations made in another orchard in a different part 

 of the State, during the summer of 1913, showed quite conclu- 

 sively that where young Mcintosh apple trees having an abun- 

 dance of limb infection with apple scab from the season before 

 were sprayed with a dormant strength lime-sulphur solution 

 just as the leaf buds were opening, in addition to the regular 



