44 



ICE "WATER. 



This was used in spray and poured upon the plants in quantity, also 

 worms were submerged in the water for periods of time up to ten seconds. 

 Every trial showed this to be utterly valueless as a remedy. Occasion- 

 ally a small worm would be injured but in no case that I observed were 

 any killed outright. Temperature of water during trials varied from 

 35° to 38° Fan., air from 9(P to 95° Fah. A hot day was purposely 

 selected for the work. 



TANSY WATER. 



Strong decoctions of this were made both by soaking and boiling the 

 leaves. In both cases it was apparently as strong as could be made. 

 Used in the field, no result whatever. On worms confined in closed 

 jars they died in about six hours. In cages no effect whatever, though 

 tested repeatedly and very heavily applied. 



TOMATO WATER. 



A strong decoction of this was made by boiling and used as above 

 with quite similar results. In many instances the substance has de- 

 stroyed the worms in jars (small wide-mouth bottles) and not under 

 exposed conditions. The larvre were not drowned but only moistened. 

 This is important as showing that the manner of using a substance is 

 quite important. 



dreer's insect terror. 



This powder was used both in the field and in cages. In no instance 

 of the field trials were any of the larva? injured, though it was thoroughly 

 applied, lightly with bellows and heavily by hand. Used in cages it 

 had no effect whatever except that in one instance 20 per cent, of rapce 

 were killed where it was applied to food so heavily as to completely coat 

 it over. P. brassicce was not affected by its use though confined from 

 four to five days where food plant was completely coated with powder. 

 I feel perfectly safe in saying, after abundant tests, that this substance 

 is perfectly worthless. 



HAMMOND'S SLUG SHOT. 



This was used only on Cabbage Worms (rapce and brassicce). In field 

 tests several hundred plants were used and tests made very thoroughly. 

 At first the powder was dusted on lightly and was almost an entire 

 failure, but with repeated and heavier dustings better results were ob- 

 tained; however none of the results were sufficiently successful to com- 

 mend its use. Where used heavily not over 20 per cent, of rapce were 

 killed, and brassicw were not injured. In none of the field tests was I 

 able to find dead brassicce. Worms of both species were frequently 



