DISCUSSION. 67 



Spraying will probably have to be resorted to by most apple 

 growers whose orchards are near cedar trees, unless the varie- 

 ties most susceptible to rust are discarded, and it is unlikely 

 that such varieties as Wealthy and Jonathan, for instance, will 

 be given up soon. 



APPLE SCAB. 



The tests described in this bulletin indicate that apple scab 

 can be controlled by spraying with Bordeaux mixture just be- 

 fore the apple blossoms open and again soon after the blossoms 

 fall. It should be noted that during the past season the two 

 sprayings recommended for apple scab practically coincide in 

 time with the two sprayings for cedar rust, though the earlier 

 of the recommended sprayings gave the better results in case 

 of rust, and the later of the two better results in case of scab. 



DISCUSSION. 



Mr. Harris: Why not check the trees in some way? 



Prof. Emerson: A very common recommendation is to 

 check the cedar tree with an ax, get it out of the way. It is a 

 valuable tree in some parts of the state, and in others it is not. 

 The spraying acts too as a good result this year. We are now 

 carrying on some experiments in spraying cedar trees. We 

 cannot tell a thing about it until winter. We spray the cedar 

 tree if it will do any good. I don't know yet. If it wiU do any 

 good with spraying it must be done from this time on. Prom 

 this time on the cedar rust comes from the cedar tree to the 

 apple. It may be possible to keep it off of the cedar tree, but 

 we don't know yet as to that. I have never seen any cedar 

 trees kiUed by this disease, though I have had reports to 

 this effect. 



There is another disease working on cedar trees, which is a 

 kind of a fly or blight which I don't know anything about. 

 Whether these reports that come to me are true I cannot say. 

 I have never seen a cedar tree yet that was killed by disease. I 

 have seen apple trees absolutely defoliated. 



Mr. YoungerS: Have you ever seen the cedar tree attacked? 

 Prof. Emerson: I don't know that I have. 



