112 



MR. SMITH: With regard to the railroad worm, it 

 .seems to be settled that because there are fewer railroad 

 worms where the arsenate of lead is used, that therefore the 

 arsenate of lead has killed the railroad worm, but that does 

 not necessarily follow. It may be assumed just as well 

 that they have lieen killed by more complete culture. I can- 

 not see how the arsenate of lead is going to kill the fly 

 unless it eats some of it which I believe it does not. A 

 great deal has been said about this spray nozzle; if you are 

 going to do some spraying, you cannot do as much with the 

 disc nozzle as you can with the Bordeaux nozzle. 



A :\IEMBER : IMr. Smith thinks you are likely to give 

 too much credit to arsenate of lead rather than to better 

 culture and apples picked up, 



:\IR. DAVENPORT: I wonder if using lime-sulphur at 

 winter strength Avhen the buds are breaking would not be 

 sufficient without adding the nicotine? 



PROF. PARROTT : It is a belief by some ^Morkers, 

 especially a number located in the Pacific Coast states, that 

 the application of lime-sulphur at Avinter strength is fatal 

 to the eggs of the apple lice. In New York, where we have 

 sprayed for eight or ten years extensively with lime-sulphur 

 solution, thorough sprayings with that mixture have not 

 given us protection from the plant lice. For that reason 

 we have been working on a different system of treatment 

 and have come to the conclusion that it is better to make a 

 combination of lime-sulphur and nicotine as I have previous- 

 Iv explained. 



MR. DAVENPORT: I think you have missed the point 

 a little bit ; if you delay your scale spray until after the 

 buds have broken at that time the eggs are hatching, and if 

 lime-sulphur is applied when the eggs are hatched or hatch- 

 ing, would it destroy them without the use of nicotine? 



PROF. PARROTT : Lime-sulphur is not a very efficient 

 spray for the eggs or young nymphs of the apple plant lice. 

 If you make the combination of lime-sulphur and nicotine 



