xxxvi Department of Plant Pathology 



Publications. — Publications of the Department aside from those 

 issued by the University, which are Hsted elsewhere, are as follows: 



Some species and varieties of Elymus in eastern North America. By K. M. Wiegand. 

 Rhodora, vol. 20, p. 81. 



A new variety of Triosteum aurantiacum. By K. M. Wiegand. Rhodora, vol. 20, 

 p. 116. 



The development of some exogenous species of agarics. By Miss G. E. Douglas. 

 American Journal of Botany, vol. 5, p. 36. 



Recommendations. — Provision should be made for the appointment of 

 at least one more assistant professor of plant physiology. A large pro- 

 portion of the problems in the applied sciences are primarily physiological 

 problems. The field for research is therefore very large, and there is 

 great need that many of these problems should be investigated. There is 

 also considerable demand for additional courses in plant physiology. The 

 staff is so heavily burdened with teaching and extension work that it has not 

 been possible to give the additional courses needed, nor have the members 

 had time to conduct research which they are so anxious and well qualified 

 to perform. Even if no additional courses were given, the demand for 

 research and the large number of graduate students registered would 

 indicate the need of an increase in the number of professors. 



PLANT PATHOLOGY 



H. H. Whetzel, Professor of Plant Pathology 



Investigation. — Research by members of the staff of the Department of 

 Plant Pathology has been curtailed to some extent because of pressing 

 work in connection with food conservation. As much work as possible 

 has been continued, however, since the solution of problems in plant 

 pathology usually contributes to a better understanding of disease control 

 and for that reason contributes to the general conservation movement. 



Beans are subject to a number of diseases which are very seriously 

 reducing the yield of this important crop. A hybrid bean having all the 

 qualities of white marrow and possessing resistance to the anthracnose 

 disease has been developed. A study of disease inheritance in beans is 

 being made in cooperation with the Department of Plant Breeding. 

 Bean root rot is being studied intensively under a special legislative grant 

 made for the purpose. The development of resistant strains seems to 

 offer the most promising method of controlling this disease, and the work 

 has been directed along these lines. This work is also done in cooperation 

 with the Department of Plant Breeding. Bean mosaic, a baffling disease, 

 has been studied, but as yet little is known of the nature of the disease and 

 nothing of its cause. 



The first phase of the investigation of potato leaf roll, a study of the 

 normal histology of the potato plant, has been completed and is ready 



