THE LOCAL PLANT DOCTOR. 33 



found. The report of remarkable results with lime-sulfur in some 

 of the western states brought from our apple men an insistent 

 demand that we give them some definite data on the subject. 

 Manufacturers of concentrated lime-sulfur solutions were urging 

 its use as a summer spray. We of course refused to recommend 

 it without sufficient evidence as to its safety and reliability. With 

 no special funds at our disposal we were unable to press the investi- 

 gations. The establishment of the Niagara Sprayer Company 

 Fellowship in the spring of 1909 enabled us to put a man on the 

 problem at once. 



A field laboratory was established and has been maintained 

 during the growing seasons of 1909 and 1910, right in the orchards 

 in a different locality each year. The results obtained by Mr. 

 Wallace, the holder of the fellowship, are best shown in these slides. 

 I leave it to you to judge whether his work has been profitable or 

 not. (Series of lantern slides were shown illustrating some of the 

 results obtained.) 



Apple Scab. 



Important Facts which have been established in regard to Apple Scab. 



1. The apple scab fungus winters only in the old apple leaves 

 on the ground; not in the twigs on the tree. The early applica- 

 tion for scale and blister mite is not usually effective against scab 

 and cannot safely be substituted for the application to be made 

 just before the blossoms open. 



2. The application just before the blossoms open protects the 

 foliage, and often insures a set of fruit. This application was 

 especially necessary this past season. 



3. Proper spraying just before the blossoms open (that is when 

 the color shows in the buds), by eliminating scab infection, pre- 

 vents burning of the foliage by the application to be made just 

 after the blossoms fall. Mr. Wallace has shown that scab infected 

 foliage is much more seriously injured by lime-sulfur or bordeaux 

 than is foliage which is free from scab spots. 



4. The application just after the blossoms fall is usually the 

 one which gives clean fruit. The fruit at this time is usually 

 infected by the conidia from the scabbed leaves about them which 



