78 NEW YORK STATE MUSEUM 



plant at Niagara Falls and various experiments with the grubs 

 were tried. One part of this substance mixed with 10 pounds 

 of soil was placed in a box and some grubs added. One was 

 dead the next day after having burrowed about | inch and two 

 others went to the depth respectively of 1^ and 2 inches. No 

 additional fatalities occurred even after 10 days. Several other 

 experiments gave the same general results and apparently we 

 ■can have no hopes of this substance being of value in this partic- 

 ular case. 



Recommendations. Apparently no one method can be relied 

 on to control this insect and our recommendations may be sum- 

 marized as follows: Plan cultural operations so that horse hoe- 

 ing from the vines or other cultivation will occur when the great 

 majority of the insects are in the pupal stage and take special 

 pains to thoroughly disturb the soil in the near vicinity of the 

 stem. Thorough cultivation and well enriched soil will do much 

 in aiding the vines to withstand attack. This, supplemented 

 by collecting beetles, particularly if a device can be made which 

 will catch them without the delay incident to stopping at each 

 vine, is advisable on badly infested areas during the first week 

 •or 10 days after the adult insects appear. The latter may be 

 supplemented or replaced by thorough spraying with an arseni- 

 cal poison, preferably arsenate of lead, when the beetles begin 

 to appear. Evidence at hand is rather condemnatory of spray- 

 ing in tlje field, but laboratory results indicate that it should be 

 thoroughly successful, and later experiments may demonstrate 

 this to be the case. 



BIBLIOGRAPHY 



. 1866 Walsh, B. D. Pract. Ent. 1:99. (Injurious in Kentucky) 



1867 Pract. Ent. 2:87-88, fig. (Original description and 



observations on habits and allied species) 



1867 Pract. Ent. 2:118. (Injurious in St Louis and 



Bluffton Mo.) 



1868 Riley, C. V. Noxious, Beneficial and other Insects of 

 Missouri, 1st Pep't, p. 132-33. (Brief general notice); same in 

 Mo. State Board Agric. 1th Kep't 1868, 1809. 



