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An experiment in cooperation with the Plant Breeding Investigations of the
Bureau of Plant Industry, U. S. Department of Agriculture
STATION OFFICERS BROWN AYRES, President of the University H. A. MORGAN, Director, Zoologist and Entomologist; State Entomologist S. M. BAIN, Botanist C. A. Mooers, Chemist and Agronomist C. A. KEFFER, Horticulturist S. E. BARNES, Field Expert in Dairying, in cooperation with the U. S.
Dept. of Agr.
The Station has facilities for analyzing fertilizers and cattle foods; for testing milk and dairy products; for examining seeds with reference to their purity or germinating power; for identifying insects, grasses and weeds; and for investigating insect enemies and diseases of fruit trees, grains and other useful plants.
Packages by express, to receive attention, should be prepaid.
@ The Experiment Station building, containing the offices and laboratories, and the plant house and part of the Horticultural Department, are located on the University campus, 15 minutes walk from the Custom House in Knoxville. The experiment farm, the barns, stables, dairy building, etc., are located one mile west of the University, on the Kingston pike. The fruit farm is adjacent to the Industrial School and is easily reached by the Lonsdale car line. Farmers are cordially invited to visit the buildings and experimental grounds. Bulletins of this Station will be sent, upon application, free of charge, to
any farmer in the State.
SELECTION FOR DISEASE-RESISTANT CLOVER
A PRELIMINARY REPORT
A NEW CLOVER DISEASE*
The farmers of Tennessee have for a number of years had serious difficulty in raising red clover. The trouble has been gradually increasing in severity until within recent years the crop has had to be almost entirely abandoned in many parts of the State. This condition of affairs has seriously interfered with the general agricultural practice here, for it appears that no other crop can fully replace red clover' in our prevalent system of farming.
In 1905 the writers began an investigation of the question, and early in the season found a new and hitherto undescribed fungous disease belonging to a class generally known as anthracnose. This fungus belongs to the genus known to botanists as Colletotrichum, and has been given the scientific name Colletotrichum trifolii. The Colletotrichums are known to be the cause of a number of other serious plant diseases, whose general behavior is quite similar to the clover anthracnose here considered. Several other diseases were found on red clover here, but none of them appears to do injury to the crop at all comparable to this new anthracnose. The disease was found in almost every clover field visited, and seems to exist in its severest form in the oldest and best farming sections of Tennessee. While beyond a doubt other clover diseases than those thus far found will eventually come to light in the State, and may prove to be of considerable importance, there can now remain little doubt that the one here discussed is far more responsible for the failure of the clover crop than any other disease or soil condition.
While it is not the purpose here to discuss conditions elsewhere, it is nevertheless of interest to know that the same disease has been found also in West Virginia, Kentucky and Arkansas. It is impossible to state at present anything very definite as to its geographical extent. It occurs also on alfalfa, having been found to cause considerable injury to that plant at one point in Virginia, and here at the Experiment Station farm. Its occurrence in these widely separated localities makes it at least probable that the disease is widely disseminated.
*An announcement of the discovery of the disease here under consideration was made in Science, Vol. 17, p. 503, 1905. A technical description of the fungus (Colletotrichum trifolii) causing it occurs in the Journal of Mycology, Vol. 12, p. 192, 1906. A detailed account of studies on the life history of this fungus will appear in a future bulletin of this Station.