78 



Willi ;irs(Mial.(i of lead (K' i)()un(ls to 100 i>"all<)ns) twice, just l)ef ore 

 blossoming and ai;ain wlien tlio fruit was al)Out the size of grape 

 seeds. The vinoyardists state that these sprayings gave almost abso- 

 lute protection to tlie crop. The point is to poison the early brood of 

 larvje that feed externally on the blossoms and verj' small fruits. 



AVe found that many of the larvae of this grape pest were killed by 

 a Braconid parasite {Bntcoti scutator). 



Continuing the discussion, Mr. Webster gave some of the results of 

 the experiments which he had made for controlling the grape root 

 worm in Ohio. He exj)ressed the opinion that as this species was 

 subterranean in its habits during the larval stage, great care was 

 necessar}^ in drawing conclusions concerning any exi^eriments for its 

 control, he himself having been frequently disappointed. 



Mr. Felt stated that he had seen considerable spraying with arsen- 

 ical poisons for destroying this i)est, and in these instances, as well 

 as in his own experience, the measure had iiroved unsatisfactory. lie 

 cited a case where two vineyards had been carefully investigated; 

 one was sprayed and the other was not. At the close of the season 

 there were relatively more grubs about the spraj'^ed than the unsprayed 

 vines, and he has yet to find a vineyard where satisfactory results fol- 

 lowed this treatment. His experiments showed that if pupse were 

 killed b}^ cultivation at the i^roper time, and the beetles collected and 

 destroyed at intervals of five days, so long as they were abundant 

 enough to warrant this measure, the numbers of the j)est were very 

 greatly decreased. 



MORNING SESSION, THURSDAY, DECEMBER 31, 1003—9 A. M. 



The meeting was called to order by Mr. Washburn. Letters Avere 

 read by the secretary from Miss Murtfeldt, Mr. Skinner, and Mr. 

 Smith, expressing regret that they were unable to be present at the 

 meetings. A letter Avas also read from Prof. William Trelease, con- 

 taining an invitation to the members of the Association to visit the 

 Missoiiri Botanical Gardens, which was unanimously accepted. 



The following paper was presented: 



NOTES OF THE YEAR FROM COLORADO. 



By C. P. Gillette, Fort Collins, Colo. 

 [Witlidrawn for piiblication elsewhere.] 



Mr. Gillette exhibited a collection containing some of the insects 

 discussed in his paper, and stated that the wheat-stem maggot that 

 he referred to attacks the steins of the wheat plant. 



Mr. Fletcher suggested that this insect be called the Colorado 



