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VEGETABLE DISEASES ROUND TABLE 



Dr. Reddick: I think Mr. Rogers has been planning to do some- 

 thing of that sort. 



Mr. Greffrath: I heard Mr. Rogers said he had tried it and 

 failed. 



Professor Whetzel : I would like to ask a question : Have you 

 ever had experience in spraying onions .^^ 



Mr. Greffrath: About seven years ago I made a rig that we 

 pumped by hand. I had twelve nozzles. I could not get pressure 

 enough. 



Professor Whetzel: Did the stuff stick.^^ 

 Mr. Greffrath: No. 



Professor Whetzel : What are you going to make it stick with.^ 



Mr. Greffrath: I am trying to find some sticker. 



Professor Whetzel: I sprayed onions all one season, using all 

 kinds of stickers. I was never very well satisfied with the results as 

 far as sticking was concerned. The problem is one of a sticker. If 

 you can make the stuff stick, I think you can control the blight. I 

 believe you will have to begin to spray onions much earlier than has 

 been done in the past. 



Mr. Greffrath: If we examine our onions early in the morning, 

 we find them wet with dew from top to bottom. There is some way 

 of applying moisture so every part is covered. I believe the solution 

 is in getting it on in a fine mist. 



Dr. Reddick: Are you going to have a gasoline engine .^^ 



Mr. Greffrath : I have horse power. 



Professor Whetzel: The dew goes on in a different fashion. 

 The difficulty with the spray is to put on just enough and not a drop 

 more. That is a good deal more difficult than it seems to be. We 

 talk about putting a spray mixture on in a fine mist. That is the 

 ideal condition, but it is mighty seldom any spray mixture is put on 

 in exactly that fashion. I feel satisfied that my failure to control 

 the blight was largely due to the fact that I could not move the nozzle 

 at the right rate to just cover the plants and no more. The other 

 solution is to find some kind of sticker which, even if you do drench 

 the tops, will distribute it over the surface. A resin-sal-soda solution 

 did the best of anything I ever used. However, not only were the 

 onions stuck up, but the man who sprayed and everything else. 



