SPRAYING EXPERIMENTS. 



61 



Table II. — Effect oj spraying on a/pple scab. 



Tree 

 No. 



1,2 

 3,4 



5 



6 



7-9 

 10-12 

 13-15 

 16-18 

 19-21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



32 



33 



34 



35 



Variety. 



Wines ap 



Maiden Blush. 

 Sweet June 



U ii 



Jonathan.. 



Ralls Genet 



u 

 (( 



No. of 

 spray- 

 ings. 





 1 

 

 1 

 

 1 

 1 

 2 

 3 

 

 

 1 

 1 

 2 

 2 

 2 

 3 

 

 

 1 

 2 

 2 

 3 



Dates of spraying. 



May 27 

 May 23 



May 9, 



May 28 



May 9, May 28 



Apr. 27, May 9, May 28 



No. of Fruits. 



Scabby 



Apr. 26, 



May 23 



Apr. 26, May 23 



Apr. 26, May 23 



May 7, May 23 



Apr. 26, May 7, May 23 



Apr. 26, 



May 7, May 23 



May 7, May 23 



Apr. 26, May 7, May 23 



248 



36 



1.33 



12 



39 



20 



10 



2 



2 



54 



49 



46 



2 







1 











1185 



210 



80 



4 



13 



16 



Not 

 scabby 



63 



169 



71 



273 



11 



30 



40 



48 



48 



46 



51 



54 



98 



100 



99 



100 



100 



400 



59 



25 



258 



252 



1411 



Per 



cent of 



scabby 



fruit. 



80 



13 



65 



4 



78 



40 



20 



4 



4 



54 



49 



46 



2 







1 











75 



78 



76 



2 



5 



1 



In the records of the tests given in the above table, two or 

 three facts stand out with special prominence. (1) The un- 

 sprayed fruit was very scabby, running from about 50 per cent 

 in case of Jonathan to 80 per cent with Winesap. (2) The first 

 spraying, April 26 and 27, when the leaf buds were just open- 

 ing, afforded no protection to the fruit. Trees sprayed late in 

 April and not sprayed afterwards, had practically as scabby 

 fruit as unsprayed trees. (3) The third spraying, May 23 and 

 28, gave very good results. Winesap trees sprayed only once 

 late in May showed only about 13 per cent of scabby fruit as 

 against 80 per cent for unsprayed trees, and Maiden Blush only 

 4 per cent of scab on sprayed as against 65 per cent on un- 

 sprayed trees (see figs. 7 and 8), (4) The second spraying, 

 May 7 and 9, while beneficial in practically all cases, was not 

 quite so eifective in controlling scab as the later spraying. (5) 

 The best results followed two sprayings, one early and one late 

 in May. This is well shown in case of Sweet June, where an 



