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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 8 



worm in most cases penetrated the silk below the poison before attempt- 

 ing to feed. The maintenance of the small pile of dust placed on the 

 silks in course of hand application caused the poison to filter down 

 between the silks as they grew and kept the very zone in which feeding 

 began poisoned. In this way the hand applied poisons effected satis- 

 factory control while the machine applications failed. 



Mr. F. C. Bishopp: Mr. McColloch is to be congratulated. 

 The control of the boll worm is certainly rather difficult in the case 

 of corn. It seems apparent that they do not have the worm as badly 

 in these two states, Kansas and Missouri, as we had farther south. 

 In Texas for instance, almost 100 per cent of the ears are infested in 

 certain localities. The number of worms is apparently much greater. 

 There we have found that often corn ears are infested by larvae which 

 hatch from eggs deposited on the husks or somewhere else than on the 

 silk, within one day or less after the silk begins to put out. You would 

 have to begin your poisoning the minute the ear begins to show silk. 

 Another point, I fear we will experience much difficulty in getting this 

 poisoning system established in many of the corn-growing regions. 

 While it may be practical on a rather small scale, it is doubtful if the 

 same method will be generally applicable. 



Mr. Leonard Haseman: We also get worms in every ear of late 

 corn so that not merely 70 or 80 per cent but 100 per cent injury 

 occurs in the case of late maturing corn. 



I would like to ask Mr. McColloch if he has used poisoned bait for 

 the moths; and also if he notes any difference in the work of the pest 

 on ears which have been opened slightly just at ''shooting" time? 

 We seem to find that if we open the ears slightly at the tip, we have less 

 worms than where they are untouched. 



Mr. J. W. McColloch: We tried the poisoned baits on moths 

 and also attempted to catch them in fly traps, but the results were 

 practically negative. 



Mr. T. B. Symons: I would like to ask Mr. McColloch as to 

 diluting arsenate of lead? 



Mr. J. W. McColloch: Sixfcy-three per cent arsenate of lead 

 contains 63 parts of arsenate of lead and 37 parts of sulphur. 



President H. T. Fernald: I would like to say as a matter of 

 record in addition that during the twenty-eight years that the Experi- 

 ment Station in Massachusetts has had an Entomological Depart- 

 ment, four cases, I believe, of the occurrence of the corn earn worm 

 have been recorded, all of these from the extreme southern or south- 

 eastern portion of the state, from the territory that I have in my 

 address alluded to as rather typically southern in its nature. 



President H. T. Fernald: The next paper will be read by Mr. 

 George A. Dean. 



