New York Agricultural. Experiment Station. 



393 



Rows 5 and 12 were sprayed five times witli Bordeaux mixture 

 (l-to-7 formula) and Paris green. 



Bows 6 and 13 were sprayed five times with Bordeaux mixture 

 d-to-T formula) alone. 



Rows 7 and 14 were sprayed five times with Bordeaux mixture 

 (1-to-ll formula) and Paris green. 



The several applications were made to all fourteen rows on the 

 same dates, namely, June 11, June 26, July 10, July 24 and Au- 

 gust 7. The last application was omitted from Rows 4 and 11. 

 All liquids were applied with a knapsack sprayer and care was 

 taken that each row received practically the same quantity. In 

 all cases where Paris green was used (except on Rows 1 and 8), 

 it was used at the rate of one ounce of Paris green to four gallons 

 of liquid. The first application was made when the plants were 

 about six inches high. 



Prevalence of insects and disease. — No trace of late blight ap- 

 peared and only a small amount of early blight. Flea-beetles 

 were moderately abundant and Colorado potato-beetles very 

 abundant. For a few days after the first .treatment, June 11, the 

 potato-beetles were scarce, but by the time of the second treat- 



comparative effect of different p'ungicides and insecticides upon 



Yield of Potatoes. 



KIND OF treatment 

 RECEIVED. 



Product of the 

 Two Rows. 



Fungiroid and Paris green, 5 

 times 



Paris green in lime-water, 5 

 times 



Paris green in lime-water, 

 once; "Lion Brand" Bor- 

 deaux -{- Paris green, 4 times 



l-to-7 Bordeaux-f-Paris green, 



4 times 



l-to-7 Bordeaux+Paris green, 



5 times 



l-to-7 Bordeaux, 5 times 



1-to-ll Bordeaux -|- Paris 



green, 5 times 



Ba. 

 7.25 



8.00 



8.38 



10.63 



11.00 

 8.75 



11.25 



Bu. 

 3.00 



2.50 



1.75 



1.50 



1.25 

 1.50 



1.00 



Computed Yield Pee 



ACBE. 



.2 



3 ^ 



% 



Bu. 

 62.50 



68.75 



72.25 



91.50 



94.75 

 72.25 



97.00 



3 



Ba. 

 25.75 



21.50 



15.00 



12.75 



10.75 

 13.00 



8.50 





Bu. 



88.25 



90.25 



87.25 



103.25 



105.50 

 88.25 





ii 



2? 





3 S! 



= s a 

 t:^8 



Bu. 



6.25 



-f 3.50 

 + 22.75 



-f 26 



+ 6 50 



105.50 + 28.25 



