30 BULLETIN 866, U. S. DEPARTMENT OF AGRICULTURE. 



Table 10. — Effect of various sprays on bitter rot of apples ( Virginia). 



Plat No. 



Tree 



No. 



Spray used. 



Copper 

 sulphate 

 in spray. 



Total 

 apples. 



Total 



apples 



with rot. 



Apples 

 with rot. 



Dropped 

 apples. 



Apples 

 injured 



by 

 spray. 



Defolia- 

 tion. 



1916. 

 3 



1 

 2 

 3 

 1 

 2 

 3 

 1 

 2 

 3 

 1 

 2 

 3 

 1 

 2 

 3 

 1 

 2 

 3 



Pickering (A) 



.do 



Per cent. 

 0.13 

 .13 

 .13 

 .065 

 .065 

 .065 

 .23 

 .23 

 .23 

 .115 

 .115 

 .115 



2,522 

 2,724 

 2,543 

 2,934 

 2,576 

 1,852 

 1,820 

 91 

 2,068 

 1,312 

 1,797 

 1,961 

 3,184 

 3,277 

 1,196 

 3,375 

 1,628 

 2,036 



2,495 

 2,701 

 2,527 

 2,918 

 2,574 

 1,846 

 1,810 

 86 

 2,000 

 1,297 

 1,794 

 1,961 

 3,144 

 3,265 

 1,196 

 2,566 

 1,200 

 1,885 



Per cent. 



99 



99 



99 

 100 

 100 

 100 

 100 



95 



97 



99 

 100 

 100 



99 

 100 

 100 



76 



74 



93 



/ -6 

 1 .2 

 J -3 

 I 1-2 

 / 4.1 

 I -9 



{ i 



.5 

 15.2 



.1 



.5 

 10.3 



.6 



3.5 

 2.0 



17.0 

 .0 



Per cent. 



Per cent. 



Per cent. 



3 









3 . 



...do 









4 



...do 









4 



.do 









4 



do 









5 



Pickering (C) 



.... do 









5 









5 .. 



. do . 









6 



...do 









6 



do 









6 



do 









Check 











Do 













Do 















Bordeaux, 4-5-50 



do 



1.00 

 1.00 

 1.00 



.50 

 .25 

 .13 



.50 



.25 

 .13 

 .50 

 .50 



















do 









1917. 

 Aj 



do 



3.0 

 5.2 

 3.0 

 6.3 

 10.0 

 10.0 

 12.7 

 9.3 

 45.5 

 35.7 

 12.3 

 6.0 

 10.5 

 5.5 



96.2 



50 













A 2 



82.3 



ffi 







do 









A 3 



95.7 



50 







Pickering (C) 



do 









Bi 



93.6 



30 













B, 



98.0 



18 



B 3 





do 







20 







Bordeaux, 2-2-50 



Bordeaux, 2-1-50 







25.0 

 98.0 



15 











20 



Check.... 















Bordeaux, 4-4-50 



Pickering (C) 



Barium water 



1.0 



.58 

 .60 







55.8 



20 



1918. 





5,724 

 2,594 

 3,736 

 4,552 



200 

 50 



736 















Check.... 















Bordeaux, 4-4-50 



1.00 





















Bitter rot was first seen in this orchard on July 10. On July 13, 

 the time of the second spray application, there was a little bitter rot 

 on two of the Bordeaux-sprayed trees and on one check tree. A 

 small unhealthy tree in plat 5 showed the most bitter rot. On July 

 26, at the time of the third spraying, the following observations 

 were made: 



Plat 3. — All trees showed a little bitter rot. 



Plat 4- — -All trees showed a little bitter rot. 



Plat 5. — One tree showed a little bitter rot, and the other two trees 

 a good deal of rot. 



Plat 6. — One tree showed rot at the top, while the other two were 

 practically free from rot. 



Bordeaux-sprayed plat. — Some trees showed no rot and others 

 quite a little. On an average, the trees did not show as much rot as 

 the check trees. 



Clieck plat. A good deal of rot was seen, more than on the other 

 trees in the orchard. 



