82 TRANSACTIONS OF THE ILLINOIS 



Animated discussion followed the reading of Mr. Riehl's report. 



Dr. Scliroeder — Did you find Phyloxera in any of these vine- 

 yards ? 



E. A. Riehl — I did not examine them critically, but have no 

 doubt they were there. 



Prof. Budd — What do you mean by rot? I know what it is in 

 Michigan, and have received many inquiries about it in Iowa, but I 

 do not think we have it in our State. We often find a hard patch 

 on our grapes, but it is caused by fungus, or the sting of a thrips. 



E. A. Riehl — We have the rot, and no mistake. First a white 

 spot appears, which spreads rapidly, and if the weather is warm it 

 soon does its work of destruction. If we plant seed of any kind in 

 warm wet weather, it will germinate rapidly. So with the grape rot, 

 climatic conditions have much to do with it. Vineyards should be 

 located where the sun will strike the vines in the morning. A 

 northern exposure will not do. 



D. B. Wier — I think Mr. Riehl is on the right track. I have 

 spent two seasons in Arkansas, and find that on the low land the 

 humid atmosphere causes all the grapes and peaches to rot. On the 

 high lands they are but little affected. 



Dr. Schroeder — Many years ago I planted a Catawba vineyard, 

 and the fourth year the grapes began to rot. I tried sulphur but it 

 did no good. I tried mulching, thorough cultivation and everything 

 else I would hear or think of, but still the grapes rotted. Is it 

 caused by bactarie, or is it a disease of the wood or roots? I hope 

 Prof. Burrill will dig to the bottom of this subject. 



Prof. Burrill — The grape is subject to two rots — the brown 

 and the black. What Dr. Engleman calls brown rot is what I de- 

 scribed last night. The black rot is not so common but is very 

 destructive. 



Question — Is not this rot a forerunner of Phyloxera? 



Prof. Burrill — I do not think there is any relation between 

 them. They are dreading this disease in Europe, and there is but 

 little doubt of its reaching them soon. 



A voice — Describe the rot. 



