16 



BULLETIN 712, U. S. DEPARTMENT OF AGRICULTURE. 



Thermograph records during the period from June 8 to 18 revealed 

 the following temperatures: 



Maximum shade temperatures. 



Date, 1916. 



Maxi- 

 mum. 



Date, 1916. 



Maxi- 

 mum. 





°F. 

 90 

 72 

 81 

 87 

 90 

 95 



June 14 



97 



June 9 .". 



June 15 . . . 



100 



June 10 



June 16 



102 



June 11 



June 17 



100 



June 12 ... 



June 18. . 



82 



June 13 











There was no measurable precipitation during this period. The re- 

 sults again emphasized the danger of applying sulphur sprays when 

 hot, burning sunlight is expected to prevail. 



Table II. — Results of spraying experiments for the control of apple powdery 

 mildew at Wenatchee, Wash., in 1916. 





Spray 

 formu- 

 lae 



Dates of ap- 

 plication.?) 



Spray injury, c 



Foli- 

 age in- 



Variety and plat. 



On June 22. 



On Aug. 1. 



Total. 





Foliage. 



Fruit. 



Foliage. 



Fruit. 



Foliage. 



Fruit. 





Jonathan f 



No. 1 



j 5S 

 | 5SL 



\ 6 



] 6L 



i 2 

 j 2L 



I 3 

 1 3L 



i 8 



] 8L 



Apr. 22 



May 10, June 



10. 



Apr. 22 



May 10, June 



10. 



Apr. 22 



May 10, June 



10, July 21. 



Apr.22 



May 10, June 



10. 



Apr.22 



May 10, June 



10. 



Apr.22 



May 10, June 



10. 



Per ct. 

 1 



1 



2 



3 



1 



5 



Per ct. 



18 



10 

 10 

 12 

 13 

 21 



Per ct. 

 (d) 



(d) 

 (0 



(d) 

 (d) 

 (d) 



Per ct. 

 (d) 



(«) 



(d) 

 (d) 

 (d) 



Per ct. 

 1 



1 



3 



3 



1 



5 



Per ct. 

 18 



10 



10 



12 



13 



21 



Per ct. 

 1.1 



No.2 



1.4 



No.3 



.4 



No. 4 



.3 



- No. 5 



.5 



No. 6 



.2 





4.0 



Pry or Red: 



No. %f 



\ 9 

 | 9L 



i 13 L 

 11a 



11 aL 

 12 



I 10 

 i .10 L 



Apr. 22 



May 10, June 



10. 



Apr. 22 



May 10, June 



10. 



Apr.22 



May 10, June 



10. 



Apr. 22 



May 10, June 



10. 

 Apr. 22, May 



10, June 10. 



do 



do 



I • 

 1 ■ 

 1 



i : 



5 



37 



19 



25 



43 



32 



35 

 17 



22 



(d) 



(d) 



(d) 



(d) 

 (d) 



9 50 



(d) 



(d) 



(d) 

 (d) 

 ( d) 



(d) 



(d) 



(d) 

 (d) 



5 



1 



2 



1 



55 



37 

 19 



25 



43 



32 



35 

 17 



22 



1.1 



No. 9/ 



1.0 



No. 10/ 



1.5 



No. 11/. 



.7 



No. 12/ 



1.4 



No. 13/ 



1.5 



No. 14/ 



1.2 



No. 15 



Apr.22 



May 10, June 

 10. 



1 



1.1 



No. 16/ (check) 



16.2 



Black Ben Davis: 

 No 17 



14 S 

 { 2L 



July 21 















7.1 



No. 18 . 



Apr.22.'.."!!!! 

 July 21 



\ 





(A) 



(A) 



(A) 



(A) 



9.4 



No. 19 (check) 



/ 





15.1 





















a For composition of sprays used, see pp. 11-12. 



b Buds in the "pink" (just before full bloom), Apr. 22; petals fallen, calyx not yet closed, May 10; other 

 applications at the time of regular codling-moth sprayings. Where lead arsenate is not shown in the sched- 

 ule for the applications on May 10 and June 10, separate applications of this material were made following 

 the fungicidal spraying, in order to avoid possible spray injury from combining sprays reputed to be chem- 

 ically incompatible. 



c Foliage injury expressed in percentage of leaf-surface reduction; fruit injury expressed m percentage of 

 injured apples found on the south side of the trees. d No increase. e Slight increase. 



/ Trees sprayed in the same manner as in 1915. 9 Increase. h Slight injury. 



