124 Report of the Botanist of the 



use an abundance of lime and no injury resulted. In both treat- 

 ments the " bugs " were practically all killed. 



At Riverhead: Series I. — This series consisted of four rows® — 

 Nos. I, 4, 7 and lo, which were sprayed with bordeaux mixture three 

 times; namely, on June 5, July 22 and August 7. Poison (white 

 arsenic) was used in all three sprayings at the rate of one pint of the 

 stock solution'^ to 50 gallons of bordeaux. 



Series II. — This series consisted of four rows — Nos. 2, 5, 8 and 11. 

 They were sprayed with bordeaux mixture five times ; namely, on 

 June 5, 24, July 7, 22 and August 7. As on Series I, poison was 

 used with every application. Perhaps it was unnecessary to use 

 poison so frequently, but as there were always a few flea-beetles and 

 a few " bugs " and the poison cost so little it was thought best. 



Series III. — Series III, also, consisted of four rows, — Nos. 3, 6, 

 9 and 12, The rows of this series were not sprayed at all with 

 bordeaux, but when the " bugs " appeared in destructive numbers 

 (July 7) they were promptly treated with white arsenic, one pint of 

 the stock solution in 50 gallons of lime water. This one treatment 

 freed the plants from " bugs " and there was no further trouble with 

 them. 



THE RESULTS OF THE TEN-YEAR EXPERIMENTS. 



AS INDICATED BY THE CONDITION OF THE FOLIAGE. 



At Geneva. — Potato bugs did no appreciable damage to any of 

 the plats. Twice they appeared in considerable numbers, but were 

 promptly killed before they did any damage. Although poison was 

 used with the bordeaux but once on the rows in Series II, " bugs " 

 were less numerous on this series than on Series I where it was neces- 



°It may be observed that the rows here given for Series I are not the 

 same as those given in Bulletin 221, p. 244. This change is the result of a 

 rearrangement which was made for the purpose of bringing the rows in each 

 series into the same order as in the experiment at Geneva. 



'For formula see footnote on page 256. 



