78 



with arsenate of lead (10 pounds to 100 gallons) twice, just before 

 blossoming and again when the fruit was about the size of grape 

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

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

 larv?e that feed externally on the blossoms and very small fruits. 



We found that many of the larva? of this grape pest were killed by 

 a Braconid parasite (Bracon 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 expressed the opinion that as this species was 

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

 necessary in drawing conclusions concerning any experiments 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 pest, and in these instances, as well 

 as in his own experience, the measure had proved unsatisfactory. He 

 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 sprayed than the unsprayed 

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

 lowed this treatment. His experiments showed that if pupa? were 

 killed by cultivation at the proper 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 pest were very 

 greatly decreased. 



MORNING SESSION, THURSDAY, DECEMBER 31, 1903—9 A. 31. 



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 was also read from Prof. William Trelease, con- 

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

 Missouri Botanical Gardens, which was unanimously accepted. 



The following paper was presented : 



NOTES OF THE YEAR EROM COLORADO. 



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

 [Withdrawn for publication elsewhere.!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 stems of the wheat plant. 



Mr. Fletcher suggested that this insect be called the Colorado 



