AGRICULTURAL SCIENCE AT THE ST. LOUTS MEETING-. 547 



was also made of the injui'ics from o-rasshoppci's, chinch huo-, and 

 Hessian Hy. Some evidence was presented by the author for the appar- 

 ent occurrcMu-e of i^ broods of this insect in Minnesota. 



M. V. Slingerland gave an address on Insect PhotogTaph}'. The 

 history of the work was outlined, with special reference to the devel- 

 opment of microphotography and half-tone work. Attention was 

 called to the occasional abuse of photography in scientitic work, and 

 suggestions were given regarding the field of greatest usefulness of 

 photography in illustration. Necessary apparatus and methods of 

 preparing specimens were outlined. 



The same speaker gave an account of New York grape pests, with 

 special reference to the grape- root worm and grape-leaf hopper. 

 Experiments in spraying with arsenate of lead gave promising results 

 in controlling the root worm. The leaf-hoppers were successfully 

 captured by the use of a large sticky shield, or were destroyed by a 

 weak oil or soap spray. The grape fruit moth can be controlled by 

 hand picking. Infested fruits may ])e recognized and picked oti' for 

 about $2 per acre. The same speaker also presented a general paper 

 on insect depredations in New York, with special notes on plant lice, 

 pear psylla, skigs, rose chafer, cabbage maggots, onion maggots, plum 

 curculio, apple bucculatrix. and apple-leaf blister-mite. 



Arsenate of Lead as a Remedy for Codling Moth was the subject 

 of a paper by A. F. Burgess. Experiments were made on an orchard 

 of 1,700 trees. Without treatment only one-fourth of a crop had been 

 obtained. Disparene and arsenate of lead were used, being applied 3 

 times. The quantitj^ of perfect apples varied from 7 to 81 per cent, 

 whil'e the cost of application ranged from 7 to 13 cents per tree. 



The same speaker discussed the treatment of nurser}- buds. Peach 

 buds were fumigated with hydrocyanic-acid gas or were dipped in 

 whale-oil soap. The Inids were not injured In^ either treatment. The 

 gas was found to be ver}- effective in killing the San Jose scale while 

 whale-oil soap was less so. The speaker also presented a paper on 

 economic insects in Ohio for 1903, with special reference to chinch 

 bug, Hessian fly, apple aphis, cankerworm, white grubs, grape-root 

 worm, woolly aphis, San Jose scale, grape berry moth, willow curculio, 

 and oyster-shell bark-louse, 



F. M. Webster discussed the relation of the systematic and the eco- 

 nomic entomologist. The systematist may greatly assist the economic 

 entomologist in identification of species. Attention was called to the 

 great need of care in description of species. Mention was made of 

 nomenclatural troubles and uncertainties. The same speaker presented 

 a paper relating to the distribution of Mi/ochroHs denticollis, M. squa- 

 mo.si(s^ asparagus Ijeetles, and harlequin ca))bage bug. 



C. P. Gillette discussed the (|uestion of what credit is necessarv to 

 be given. Attention was called to the diti'eren(^e between skilled and 



