74 NEW YORK STATE MUSEUM 



spraying the leaves with 1 pound of the poison and 1 pound of 

 lime to 100 gallons of water, and 40$ more died within four days 

 after the spraying, the general results were not at all satis- 

 factory and the reason therefor can not be given. 



The breeding cage experiments with arsenate of lead would 

 lead one to expect most excellent results in the field, but such 

 was not the case in our own experience, though this may have 

 been due to the fact that the spraying was done shortly before 

 considerable rain fell, and was followed by nearly daily precipi- 

 tations. The initial application was made July 8 and repeated 

 July 9, the rain of the preceding day making it advisable to go 

 over the entire field a second time. The ground at the time the 

 spraying was done was so wet that it was almost impossible to 

 drive a team slowly enough to do good work. Careful search 

 in the vineyard eight days after failed to reveal a single dead 

 beetle. July 31 there were plenty of beetles and many eggs in 

 Mr Northrop's vineyard where the vines had been sprayed. The 

 necessity of two sprayings resulted in the application of con- 

 siderable poison, and about five weeks after the treatment it 

 was seen that the sprayed vines had developed very little new 

 growth as compared with untreated ones. There was no per- 

 ceptible burning, yet the edges of the leaves were somewhat 

 crumpled and it is very probable that the poison checked the 

 development of the more tender shoots. 



The evidence concerning the efficacy of poisons in Ohio, as 

 pointed out on a preceding page, is somewhat contradictory. 

 Reporting on work done in 1899, Professor Webster states that 

 an examination of sprayed fields showed nothing to indicate 

 that arsenate of lead would not prove entirely effective. This 

 differs from some later experiments performed under his direc- 

 tion by Messrs Newell and Burgess the unpublished records 

 of which, through the kindness of Prof. P. J. Parrott,. 

 have been placed at my disposal. The summary of this later 

 work is as follows : " Where beetles were abundant last year 

 and vines seemingly badly injured and the arsenate of lead or 

 disparene used this year (1900) few vines have died and all appear 



