284 



Potato Spraying Trials. 



[JUNE, 



spraying Plots 9, 10, and 11 showed a fair amount of scorching, 

 and the other sprayed plots showed slight scorching. At this 

 stage the unsprayed plots looked the best. 



The second spraying badly injured the haulm of Plot 10, 

 and the damage done was obviously very serious. There was 

 also a moderate amount of scorching on plots 4, 5, and 6. 

 Although a trace of blight was present throughout the season, 

 it did very little damage. 



The unsprayed plots continued to look the best throughout 

 the season, and it seemed probable that the spraying had lowered 

 the yield on all the sprayed plots. The following table shows 

 this to have been the case. 



i 









Yield per Acre. 





Plot. 



No. of 1 



How spra^^ed. 











Spray- j 







1 







ings. 1 





Ware. ! 



Seed. 



1 



Blights.*! 



Total. 









Tons. cwt. 



Cwt. 



Cwf 



K^W t . 



Tons. cwt. 



I 



I 



Bordeaux mixture, i 















per cent., 85 gal. per 









10 18.5 







acre, 25th July . . 



Q 17 1 



10 



II.4 



2 





Bordeaux mixture,, i 

 per cent., 200 gal. 















per acre, 25th July. . 



8 17. 1 



8.5 



II.4 



9 17 t 



3 







10 17. 1 



7-1 



10 



II 14.2 



4 



2 



Bordeaux mixture, i 

 per cent., 200 gal. 

























per acre, 25th July 

 and 15th August . . 















9 8.5 



II. 4 



10 



10 9.9 



5 



2 



Bordeaux mixture, i 

 per cent., 85 gal. per 















acre, 25tli July and 

 15th August 















9 II. 4 



II. 4 



10 



10 12.8 



6 



2 



Bordeaux mixture, 2 















per cent., 85 gal. per 

 acre, 25th Juh^ and 

 15th August 



























9 11.4 



II. 4 



10 



10 12.8 



7 



I 



Bordeaux mixture, 2 

 per cent., 200 gal. 

 per acre, 26th July. . 

























9 10 



12.9 



7-1 



10 10 



8 







10 15.7 



11.4 



10 



II 17. 1 



9 



I 



Burgundy mixture, i 













per cent., 200 gal. 

 per acre, 26th July. . 















8 18.5 



8.5 



5.7 



9 12.7 



10 



2 



Burgundy mixture, i 

 per cent., 200 gal. 

 per acre, 26th July 







1 









and 15th August . . 





14.3 



i 7-1 



9 14-4 



II 



I 



Bordeaux Powder, 















26th July . . 



i 8 18.5 



14-3 



1 5-7 



9 18.5 



* Blights included any^potatoes not fit for ware or seed ; only a small 

 percentage of these were affected by Phytophthora. 

 t Probably a mistake in the weighings. 



It was estimated]! that the yield of Plot 2 was equal to that of 

 Plots 4 and 7, so that it seems probable that there was a mistake 



