16 



BULLETIN 712, V. S. DEPAETMENT OF AGRICULTURE. 



Thermograph records diirino- the period from June 8 to 18 revealed 

 the following temi:)eratures : 



Maximum shade temperatures. 



Date, 191G. 



Maxi- 

 mum. 



Date, 1916. 



Maxi- 

 mum. 



June 8 



"F. 

 90 

 72 

 81 

 87 

 90 

 95 



June 14 



"F. 



97 



.TllTlA Q 



June 15 



100 



TllTlfi 1(1 



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. 



Variety and plat. 



Jonathan: 

 No. 1., 



No. 2. 

 No. 3. 

 No. 4. 

 No. 5. 

 No. 6. 



No. 7 (check). 

 Pryor Red: 



No. 8/ 



No. 9/ 



No. 10/ 



Spray 



formu- 



la.o 



5S 

 SSL 



6 

 6L 



2 

 2L 



3 

 3L 



4 

 4L 



8L 



No. 11/. 

 No. 12/. 



No. 1.3/.. 

 No. 14 / . 



No. 15. 



No. 16/ (check). 

 Black Ben Davis: 

 No. 17 



No. 18 



No. 19 (check).. 



7 

 7L 



1 

 1 L 



9L 



13 

 13 L 



11 aL 



12 



10 

 10 L 



14 S 



2 



2L 



Dates of ap- 

 plication, b 



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. 

 Not sprayed . 



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 



Apr. 22 



May 10, June 



10. 

 Not sprayed . 



July 21 



Apr. 22 



July 21 



Not sprayed 



Spray injury, c 



On June 22. 



Foliage. Fruit, 



Per ct. 



1 . 



Per ct. 

 18 



10 



10 



12 



13 



21 



On Aug. 1. 



Foliage. Fruit 



Per ct. 



m 



(0 

 m 



m 

 (d) 



(d) 



(d) 



(d) 



(d) 

 (d) 



(7 50 



(d) 



(d) 



(A) 



Per ct. 

 (d) 



(d) 



(d) 

 (d) 

 (d) 



(d) 



(d> 



(d) 



(d) 

 (d) 



(d) 

 (d) 



(d) 



(h) 



Total. 



Foliage. Fruit, 



Per ct. 

 1 



1 



3 



3 



1 



5 



CO 



Per ct. 

 18 



10 



10 



12 



13 



21 



(ft) 



Foli- 

 age in- 

 fected. 



Per ct. 

 1.1 



.2 

 4.0 



1.1 



1.0 



1.5 



.7 



1.4 



1.5 

 1.2 



1.1 



16.2 



7.1 



9.4 

 15.1 



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



t 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 in percentage of 

 Injured apples found on the south side of the trees. ^ No increase. « Slight increase. 



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



