182 



As the time for adjournment had arrived, the discussion of this paper was post- 

 poned until the next session. 



The association adjourned to meet at 9 o'clock, November 14 



November 14, 1889. 



The meeting was called to order at 10 o'clock by Vice-President Cook. The min- 

 utes were read and approved. 



The secretary read a letter fromD. S. Kellicott, who stated that at present he con- 

 sidered himself not eligible to membership. 



Under the head of " programme" the chair announced that the discussion of Mr. 

 Gillette's paper of the previous day was in order. 



Mr. Forbes expressed himself as of the opinion that, from our present knowledge of 

 the use of the arsenites as insecticides, they can be recommended for use on the peach. 

 In spraying for codlin moth he had not found that any special benefits resulted from 

 spraying for the second brood. 



Mr. Cook had found that injury resulted to the peach from the use of white arsenic 

 stirred in cold water. 



Mr. Riley, regarding the apparent revulsion of feeling concerning London purple, 

 stated that in his opinion we must be very slow in reversing judgments, carefully 

 formed, of years of experience, and that both London purple and Paris green varied 

 in quality ; that their effects varied on different plants, and even in different kinds 

 of weather. 



Mr. Bruner presented some notes on Diabrotica longicornis, which he had found very 

 abundantly in the city of Lincoln, Nebr., as late as the middle of October. The 

 species is to a certain extent nocturnal in habit, as he had collected 250 at one elec- 

 tric light. The adults feed upon the foliage of radishes and turnips, and have been 

 found about the roots of the wild sun-flower. He has not found it breeding at the 

 roots of corn, but knows that it does so occur in his State. He thinks that it must 

 have some other larval food plant. 



In discussing this paper Mr. Forbes stated that he had failed to find this insect 

 breeding upon anything else than corn, although extensive search had been made by 

 himself and his assistants for other larval food plants. He admits that there is a 

 strong possibility that it has other food plants, and Mr. D. S. Harris thinks that he 

 has found it upon Purslane. Mr. Forbes considers the species as normally inhabiting 

 the far West and spoke of its extraordinary increase in Illinois in late years. Twenty 

 years ago Walsh mentioned the finding of three specimens in Illinois as worthy of re- 

 mark. 



Mr. Lugger had found three pupae of D. 12-punctata at the roots of Rudbeckia in a 

 field which had been grown in corn the previous year. 



Mr. Garman stated that Mr. D. S. Harris thought that he had also found it upon 

 the roots of Lambs-quarter. 



Mr. Riley stated that years ago in Missouri it was very rare, and may be considered 

 as belonging to the class of insects which have changed their habits of late years. 



Mr. Bruner had never seen a specimen in Nebraska until within the last two or 

 three years. 



The topic of " Co-operation" was then taken up for discussion. 



Mr. Lugger suggested that the distribution of beneficial insects was a subject which 

 might enter into a co-operative scheme. 



Mr. Forbes stated that he had formulated no distinct plan of co-operation, but that 

 jn his opinion there was no objection to duplication of work, but that there were, 

 rather, arguments in favor of it. 



The question resolved itself into two heads: How can State workers help each 

 other, and how can the General Government help State workers? 



On the latter point he stated that in his opinion the assistance will be compara- 

 tively of a technical character in the way of determination of specimens and ref- 



