GRAPEVINE ROOT WORM 39 



The late Prof. C. V. Riley, in his report for 1868, calls atten- 

 tion to the fact that one man whose vineyards were very badly 

 infested by this insect had trained his chickens to go between 

 the vines and pick up the beetles as they were dislodged by 

 jarring. Mr F. A. Morehouse of Ripley, who has many chickens 

 in the near vicinity of his vineyard, has practised the same thing 

 with excellent results. The only trouble is that this method 

 has a comparatively limited application, since it is Dot always 

 practical to have chickens in large vineyards. 



Arsenical poisons. A number of experiments were tried with 

 arsenical poisons in 1902 for the purpose of ascertaining their 

 efficiency in controlling this species. Two brands of arsenate of 

 lead and paris green were used. Breeding cage experiments with 

 arsenate of lead, using 2 pounds to 50 gallons of water, showed 

 that seven days were required to kill 9 out of 10 beetles, and 

 that, when 4 pounds of the poison were used to the same amount 

 of water, all of the insects were killed within eight days. The 

 spraying in both instances occurred July 5, and the record is as 

 follows : 



2 POUNDS OF ARSENATE OF LEAD TO 50 GALLONS OF WATER 



July 7, 6 beetles dead July 10, another beetle dead 



3 alive July 11 



1 missing July 12 ■" 



4 POUNDS ARSENATE OF LEAD TO 50 GALLONS OF WATER 



July 7, 4 beetles dead July 10, another dead 



July 9, 4 more dead July 13 " 



It will be seen by examining the above records that in the 

 case of the first over half were killed within 48 hours after the 

 spraying, and in the second less than half within 48 hours and 

 four fifths within four days. It should be added that in the 

 above experiments the leaves were sprayed very thoroughly and 

 the poison allowed to dry before the treated foliage was placed 

 in the cage. 



The breeding cage experiments with paris green were less 

 successful than those with arsenate of lead, and, though in one 

 experiment 20$ of the beetles were killed within 48 hours after 



