EXPERIMENTS WITH INSECTICIDES AND FUNGICIDES. 1 39 



to this plot. The adjoining plots were sprayed four more times 

 with Bordeaux mixture and a poison. The yield was much less 

 on the plot to which Kno-bug was applied and the percentage of 

 rot was very much increased. The vines died three weeks earlier 

 than on the plots treated with Bordeaux mixture. 



In this test Kno-bug was practically valueless as a fungicide. 

 The diminished yield was due to blight and not to injury from 

 insects. Applied in sufficient quantity, the Paris green contained 

 in Kno-bug will kill the bugs. 



Hammond's slug shot. 



Hammond slug shot carries sulphur, carbolic acid, Paris green, 

 and tobacco, mixed with gypsum. The manufacturers claim it 

 to carry only one per cent of arsenic. A sample examined by 

 the U. S. Department of Agriculture carried 1.58 per cent of 

 arsenic in the form of Paris green. 



Insecticides Not Containing Arsenic, 

 bug death. 



Bug Death, made by the Danforth Chemical Company, Leo- 

 minster, Mass., is unique in being, so far as has come to the 

 writer's attention, the only insecticide which does not depend 

 upon arsenic for its effectiveness. It is practically impure zinc 

 oxide. It carries more or less of iron and lead oxide and small 

 amounts of silica, chlorine, potash and phosphoric acid. These 

 latter constituents are apparently accidental and vary somewhat 

 within narrow limits. When the goods were first placed upon 

 the market, their mechanical condition was very different from 

 what it is at present. In 1900 the Experiment Station used it in 

 the field at Houlton and also in a greenhouse test. The Bug 

 Death killed some of the beetles and slugs and drove the 

 majority of the others from the plants. Many of them went 

 into a stupor lasting from 12 to 36 hours and then revived and 

 were apparently as well as ever. The goods used that year were 

 coarsely ground, feeling gritty to the touch and could not have 

 been sprayed successfully, as they would have clogged a Ver- 

 morel nozzle. The Bug Death used by the Station in the season 

 of 1902 was ground to an impalpable powder and even at the 

 rate of 40 pounds to the barrel was sprayed through a Vermorel 

 20 



