282 THE MONTHLY BULLETIN. 



urge at least that a large hole should be dug and the soil not used to 

 fill the hole but spread out to dry around it and all roots gathered up. 

 The best quality of soil, free from pieces of sticks or wood, should be 

 used to fill the hole in which to plant the trees. The fine roots I believe 

 are less liable to infection than the larger ones, so that in this way 

 resistant roots will be given the best chance to escape infection. 



I can not close this paper without calling to your attention^ that here 

 has been suggested, on the basis of experimentation, one definite way, 

 the ditch method, for stopping the spread of oak fungus disease. The 

 work suggested is not unduly difficult nor expensive and should be 

 practicable under some conditions. We hope in the next few years to 

 he able to suggest treatments more adaptable for large trees, such as 

 walnuts. 



In starting in to treat an oak fungus area, first, make sure that the 

 oak fungus is present and that you can recognize it on the roots. A 

 piece of suspected root may be sent to the University if there is any 

 uncertainty. Next, make a map of the area and locate every tree which 

 has the disease and indicate these on the map. Condition of the trees 

 should also be indicated. Then the map can be studied and it can be 

 decided exactly what should be done. I advise deliberation. The 

 problem is one which may take years to solve, but if worked at con- 

 sistently I believe may be solved in time and without extraordinary 

 expense. 



