Ill 



MR, MILLER. When you have trouble like that, use 

 something especially suited to that trouble. We who have 

 used Black Leaf 40 understand that it is a preventive, that 

 it will control the Green Aphis. If you have browntail or 

 gypsy moth, then you have got to use arsenate of lead, 

 stronger than you would ordinarily use it to control the 

 codling moth, say. My point primarily is to give the insect 

 the proper treatment, and not try to make a combination of 

 mixtures in the hope that one spray will control the entire 

 situation. 



MR. IVES. One point to be considered is that if you 

 follow one treatment by another, you are going to get into 

 trouble. You have got to follow up one fellow pretty soon 

 after you chase the first, and the overlapping of those sprays 

 is going to make trouble, and you will find it so if you try it 

 out ; if you don 't look out, you will have trouble with your 

 Black Leaf when you put on something else. 



MR. ROGERS. Is there any danger in using Black 

 Leaf 40 with arsenate of lead for spraying for codling moth? 



DR. FELT. I don't think so. 



MR. ROGERS. Years ago, in spraying in the dormant 

 season on apple trees, we used to use Bordeaux mixture 4-4- 

 50 and didn't have but very little trouble for a good many 

 years from injury, and now, just before the petals open we 

 use the 4-4-40 Bordeaux for the fungus diseases and immedi- 

 ately after they open we use arsenate of lead and sulfur 

 combined and have had no injury all through some seasons 

 and then the next season we would get injury. Why should 

 we get that under practically the same conditions? 



DR. FELT. You may get an appreciable difference in 

 the amount of application. If you spray very freely with 

 arsenate of lead and lime-sulfur in a combination, you are 

 apt to have more or less of it collect in depression in the leaf 

 and some injury, and you have therefore got to make that 

 application pretty uniform and stop before you apply too 

 much or there will be injurj^ 



MR. BILLINGS. To come back to the codling moth 

 again, I understood the Doctor to say there was no difference 

 in the pressure used in the first sprayisg, that high or low 

 pressure made practically no difference. I have had five 

 years' experience in the Northwest, and they used high 



