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extension and the nozzle should be set at an angle of 45 

 degrees or 90 degrees so that you can give a thorough spray 

 downward, then if the trees are away up high, you can spray 

 to the best advantage. You may have to use high pressure 

 to throw it up, but I am not willing to state that you are 

 going to get 95 or 98 per cent sound fruit. If your land will 

 permit, you ought to use a tower and a good long extension 

 so that, even in the case of high trees, you can reach up ; 

 then, so long as you have pressure which will give a fairly 

 good distribution at the end of your nozzle, you are all right. 

 We have found on moderate size trees that 80 pounds was 

 plenty. As you go up, you must increase your pressure, of 

 course, in order to get fairly good distribution from the 

 nozzle ; you have got to put your spray, in other words, 

 where you want it. So far as driving it down into the the 

 calyx cavity is concerned, our experience doesn't show that 

 that is necessary. 



MR. SESSIONS. If you had a young orchard that you 

 were pretty sure wasn't affected, then what about spraying? 

 Would you need to ? 



DR. FELT. That would depend a little on conditions. 

 I will get around that by saying this : in most orchards it is 

 probable that your secondary benefits resulting from lime- 

 sulfur application would pay for the treatment, and if you 

 wanted to be sure, spray ; but if I was moderately sure and 

 didn't want to spray and was willing to keep a close watch 

 on the orchard, I would see no particular hazard in taking 

 a chance. 



MR. SESSIONS. Well, knowing what the San Jose 

 scale was, and after you concluded that you didn't have 

 scale enough to necessitate spraying, what then? This is on 

 three-year old trees. 



DR. FELT. Your practical orchardist should not find 

 it necessary to go through his orchard with a microscope. 

 He ought to be keen enough to distinguish between the 

 normal, healthy bark and one that had scale. If he had any 

 experience with the San Jose scale he ought to be able to 

 detect it on young trees with the unaided eye before it be- 

 came very injurious. 



MR. SESSIONS. I have been through that experience ; 

 I didn 't know what it was. But I am not speaking so much of 



