ORCHARD SPRAYING EXPERIMENTS II. 



The insecticidal value of lead arsenate was found to be un- 

 diminished when combined with lime-sulphur sprays. 



The following table gives the results of inspecting all the 

 fruit. Each plot was examined for the scab fungus, (Venturia 

 Pomi (Fr.) Wint.), which was the only one seen on the trees 

 in this experiment; for insect injury indicated by curculio 

 stings or wormy fruit; for calyx injury and for fruit deformity 

 caused either by natural agencies, spraying, or these factors 

 combined. 



Table 2. 



Thbatment. 





:5o 







Check, Unsprayed 



Niagara Lime-sulphur. . . 

 Bowker Lime-sulphur . . , 

 Sterling Lime-sulphur . . . 

 Grasselli Lime-sulphur. . . 

 Blanchard Lime-sulphur. 



Pratt "Sulfocide" 



34 

 34 

 31 

 33 

 32 



40 



Intensified Self Boiled Lime 



sulphur 



Boiled Lime-sulohur 



Bordeaux 4-4-.50 



Bordeaux 3-3-50 



Check, Unsprayed 



31 



3,102 

 7,736 

 5,040 

 7,765 

 9,563 

 7,699 



3,660 



3,181 

 6,551 

 7,185 

 5,215 

 6,09 



58.34 

 92.70 

 93.33 



89.9' 

 88.5 

 91.08 



94.42 



84.59 

 85.25 

 83 . 29 

 85.96 

 59 . 24 



41.65 

 7.29 

 6.66 



10.03 



11.46 

 8.91 



1 



96 



2 



22 



3 



57 



1 



37 



1 



SI 



1 



64 



1.75 

 1.07 

 0.06 

 3.21 

 0.61 



5.571 44.39t 



15.40 

 14.74 

 16.70 

 14.03 

 40.75 



2.13 

 1.31 

 6.77 

 5.79 

 2.47 



1.03 

 0.09 



13.79 

 0.63 

 1.54 

 0.81 

 0.53 

 1.02 



0.16 



1.03 

 1.23 



1.51 

 1.97 

 7.33 



* On sprayed plots 50 per cent, of respective amounts so slightly scabbed as to have fair 

 market value. 

 -- t Deformity and calyx injury sufficiently coincident to combine in one count. 



t On .sprayed plots practically all fruit under this heading (except Plots 1 and 12), was 

 injured by the curculio and not by the codling moth. The latter was thoroughly con- 

 trolled. 



In planning the experiment for 1911, consideration was 

 given not only to the problems arising from the preceding 

 results at Highmoor, but also to the facts elicited and the ques- 

 tions arising from the recent work of other e.Kperiments in 

 this field. 



In the course of a number of spraying experiments con- 

 ducted in several sections of the country, the use of arsenate 

 of lead alone as a spray material gave results worthy of note. 



It appeared from the work of Taylor =^ and Waite ** that 



* Taylor, E. P. "Spraying Peaches for Brown Rot." Western Fruit 

 Grower, Oct. 1909, pp. 20-21 and Feb. 1910, pp. 16-18. 



** Waite, M. B., "Experiments on the Apple with Some New and 

 Little-Known Fungicides." U. S. D. A., Bur. Plant Industry. Circular 

 £8 (1910). 



