108 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 7 



cannot be used for a considerable number of years afterwards for crops 

 of a similar nature. A very serious feature also of nematode soil in- 

 fection is the fact that some species of nematodes have an immense 

 number of food plants. It should also be mentioned that a very serious 

 disease of citrus trees has recently been discovered to be caused by one 

 of the nematodes. Some root diseases to which attention is now very 

 sharply drawn are the various diseases of the potato tuber, which were 

 so prominent in the recent hearing held in Washington to consider the 

 advisability of total exclusion of foreign-raised tubers. 



Finally, I may say a word regarding the diseases which are known 

 to occur in imported nursery stock. 



It has only recently been discovered that the chestnut bark disease 

 is a native of China, and was undoubtedh^ imported into this country. 



The white pine blister rust is known to have been imported directly 

 from Europe. 



The potato wart and potato powdery scab occur upon imported 

 potatoes. 



Crown gall and hairy root have been found upon a considerable 

 number of different fruit trees and also upon several of the ornamental 

 shrubs. 



Azaleas have been found quite generally affected with leaf galls 

 caused by an Exobasidium. 



Rhododendrons in one case were found infected with a tiny leaf gall 

 caused by a Synchytrium. 



Miscellaneous leaf spots have been found upon a number of 

 different species of shrubs. 



Clematis has been found affected with root rot. 



Pseonia, lilac, and rose leaves and stems have been found with the 

 small black sclerotia of the fungus Botrytis vulgaris, which develop in 

 transit. 



Finall}^ may be mentioned the finding of the fruit rot fungus Glonier- 

 ella rufomaculans, irmting on avocado seeds; apparently an entirely 

 new observation for this fungus. 



In order that I may be. familiar with what you are finding in different 

 parts of the country, I have asked you to forward to me specimens of 

 diseased plants which you may encounter in j^our inspections. Free 

 and cordial cooperation in this regard will do much to make efficient 

 my own efforts to help you solve some of the knotty problems in con- 

 nection with inspection ior fungous plant diseases. 



An exhibit was made of diseased plants illustrating various symp- 

 toms of disease. 



