New York Agricultural Experiment Station. 385 



On July 11 it was thought necessary to apply Paris green 

 again. This time three pounds of Paris green were applied with 

 lime in the same manner as before. The day, however, was not 

 so suitable for the work. There was no wind but the foliage was 

 dry. Most of the beetles were killed and they did not again be- 

 come suflSciently numerous to seem to require another treat- 

 ment. 



The expense of treating the 1.09 acres with Paris green was as 

 follows: 



4% pounds Paris green at 20 cents per pound $0 90 



5 hours labor at 15 cents per hour 7^ 



Total. 



$1 (>5 



This makes the expense per acre §1.51, which is undoubtedly 

 somewhat greater than it is in ordinary farm practice. The pow- 

 der-gun was rusty and did not work well, which resulted in a loss 

 of time and waste of Paris green. 



The results.— In the caseof eachof the fourvarieties the sprayed 

 plat and the unsprayed plat were dug and weighed separately. 

 The product of each plat was also divided into " merchantable 

 tubers " and " culls," the latter class including not only the small 

 tubers but also those which had been mutilated by the potato 

 digger. The accompanying table presents the results in a con- 

 densed form: 



Ej-fec 



r OF Sprayixg witm Bordeaux Mixture upox Yield op Potatoes. 



variety and treatment. 



Victor Eose j f P^'ayed - - 



White Elephant \ p^'^J^^ ■ -- 

 ^ ( Lii.sprayeu. 



Green Mountain \ ^Prayed . 

 I Lnsprayed. 



Defender 5 Sprayed . 



( Unsprayed 



25~ 



Yield per Acre. 



Merchant- 

 able. 



Bu. 

 167 

 162 

 185 

 124 

 253 

 191 

 194 

 178 



Lbs. 

 17 

 30 

 21 

 47 

 38 

 33 

 29 

 23 



Bu. Lbs. 



15 44 



9 36 



14 49 



11 52 



13 21 



11 36 



8 47 



183 

 172 

 200 

 136 

 266 

 203 

 203 

 184 









5u. Lbs. Bu. Lbs. 



63 31 j 60 34 

 63 "so 62' ""5 



16 19 14 

 2 



16 6 



