42 NEW YORK STATE MUSEUM 



vine which had very poorly developed roots, and consequently 

 was not a fair sample of conditions in the vineyard. 

 Mr Monfort not only sprayed his vineyard twice with a power 

 sprayer, making the first application at the time the beetles ap- 

 peared and the second a week later, but went to the additional 

 trouble of going over the entire area carefully with a hand pump 

 for the purpose of spraying any which the machine might have 

 missed. He certainly tried to do a thorough job, and yet sample 

 diggings in an adjacent vineyard belonging to Mr Morse gave 

 respectively 3, 6, 3, 6, 16 and 9 grubs under different vines. The 

 two latter records could hardly be compared with those in Mr 

 Monfort's vineyard because they were fully i mile distant and 

 relate to vines which were much more healthy and vigorous. 

 It may be claimed that this is not a fair test of the poison and 

 to a certain extent this is true, yet these are results obtained by a 

 practical man in an earnest effort to reduce the pest, and as they 

 agree with our own experience are not without value. The differ- 

 ence between 75 and 150 grubs under a vine, and 5 to 12 or there- 

 abouts, represents in our mind the relative efficiency of collecting 

 and poison sprays, and our judgment is that these figures mark 

 the difference between protection and serious injury. 



The evidence concerning the efficacy of poisons io 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 tion by Messrs Newell and Burgess, the unpublished records of 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 in a more healthy 

 condition, but this is true also where none of these Insecticides 

 were used, beetles appearing later and in less numbers than for 

 several years." Professor Webster, at the writer's request, has 

 commented on the above experiments as follows. He states that 



