282 
F. A. Wolf, 
substituting soda and potash for lime with equal effectiveness. Eau 
celeste and potassium sulphide were entirely unsatisfactory. 
Bordeaux mixture has been successfully used, during the past summer, 
under conditions such as obtain in Alabama. A plot which bore a badly 
diseased crop in 1912 was selected upon which to grow the plants. All 
of the old plants and decaying fruits had been gathered up from this 
plot and burned during the preceeding autumn. Three applications of 
Bordeaux mixture, 4—4—50, were given on the following dates, Aug .27 th , 
Sept. 10 th and Sept. 22 nd . The plot comprised 60 plants, 48 of which 
were sprayed and 12 left as checks or controls. These 48 plants produced 
14 diseased fruits and the 12 checks bore 25. No record of sound 
fruits was made yet it may be noted that the plants bore heavily. 
The work both of Smith previously mentioned, and myself, esta¬ 
blishes the fact that the organisai survives the winter upon diseased plant 
parts more frequently perhaps on fruit pedicels and stems because they 
resist the decay better than fruits and leaves. Halsted has shown too 
that the disease is more destructive when the old plants have not been 
removed frem the field. From these facts it is to be expected that a 
judicious rotation would be a sufficient safe guard. Such is not the case, 
however, in that the disease appeared during the past season in a garden 
which had never before been cultivated and was removed by several 
hundred yards from the nearest cultivated soil. It also appeared in a 
green house in which Egg plants had never been grown previously and 
in a bench, the soil of which had been hauled in from the woods with 
consequently no chance of previous infection. Halsted reports a similar 
condition concerning which he states that 16 percent of the fruits on new 
ground decayed as compared with 61 percent on old ground. 
From the fact that the trouble appeared on soil not previously cul¬ 
tivated, it might be conjectured that the disease is transmitted through 
the seed. Thus far no evidence has been secured to substantiate this 
probability. Seeds, taken from the same packages as those which produced 
diseased plants in new ground, were centrifuged and the washings plated 
on agar. Several samples were thus tested with only negative results. 
Varietal resistance seems not to be a promising field for investigation 
in the control of this disease. Among the varieties grown in these ex¬ 
periments were „New York Improved“, „Florida High Bush“, „Early Large 
Purple“, „Perfection Purple“, „Black Pekin“ and „Black Beauty“, all of 
which seem equally susceptible to attack. Halsted reports a similar ex¬ 
perience with four different varieties. 
Satisfactory control of this disease must depend, therefore, upon the 
observance of proper sanitary measures, relative to the destruction of 
diseased plants and rubbish, coupled with a judicious system of rotation 
and the employment of Bordeaux mixture as a fungicide. 
2 . Corticium vagum B. et C. var. Solani Burt. 
The Rhizoctonia stage of this fungus is the cause of serious root 
diseases of many of the field and truck crops, and also of many orna¬ 
mental and wild plants. It is not to be regarded* however, as the cause 
of serious injury to Egg plants. Rolfs (6) does not so regard it from 
his observations in Florida and it cannot be said to be of economic 
