New York AGRICULTURAL EXPERIMENT STATION. 195 
EFFECT OF CERTAIN ARSENITES ON POTATO 
FOLIAGE.* 
W. H. Jorpan, F. C. Stewart AnD H. J. HUSTACE. 
SUMMARY. 
This bulletin gives an account of some experiments designed 
to determine in what extent and in what manner paris green 
and arsenite of lime are injurious to potato foliage. 
In an experiment with paris green this well-known insecticide 
was applied four times by three common methods: viz., with 
water, with lime water and with bordeaux. Other rows received 
bordeaux only while still others were left untreated for a check. 
At no time during the experiment, not even when the paris 
green was applied at the rate of 414 pounds per acre, was there 
any indication of injury to the foliage. On the contrary, the 
rows receiving paris green in water and also those treated with 
paris green in lime water were conspicuously more perfect in 
foliage than were the check rows. This difference was due to the 
partial prevention of late blight. It was shown conclusively 
that paris green has considerable value as a fungicide—at least 
one-third as much as bordeaux. Rows treated with paris green 
in water outyielded the check rows by 46 bushels per acre. 
Rows treated with paris green in lime water yielded 12 bushels 
per acre less than those receiving paris green in water; but it 
is possible that this difference was the result of natural variation 
and not due to the lime. 
Rows receiving paris green in bordeaux gave slightly larger 
yield than rows receiving bordeaux only. 
In an experiment with arsenite of lime, arsenite of soda stock 
solution prepared by the Kedzie formula was applied with lime 
water and also with bordeaux. In lime water it injured the 
foliage severely although two pounds of quicklime were used 
— 
*A reprint of Bulletin No. 267. 
