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New YorK AGRICULTURAL EXPERIMENT STATION. Zoe 
RESUME OF CHESTER’S WORK* ON AN “ ANTHRAC- 
NOSE OF THE WATERMELON.” 
During the autumn of 1890, a diseased watermelon vine was 
sent Mr. F. D. Chester at the Delaware Experiment Station 
from some point in that state, and he describes it as follows: 
“ Where the vine stalk was yet green, it was found to be covered 
with elongated dark patches and irregular areas; tendrils, buds 
and leaf stalks were invariably black and dead, the leaves were 
covered with black blotches marked in many cases, by more 
or less distinct eccentric rides.”? He recognized ‘“ pustules ” 
on the leaf-spots as fruits of a Phyllosticta. 
The vine was thrown upon a rubbish heap out of doors, where 
it was seemingly left until 1892 and then used again for in- 
oculation purposes; though from another place® it seems that 
the material, used for the inoculation in 1892, must have been 
collected in 1891, because the disease is said to have been un- 
commonly destructive during 1891.7 To quote: “ The disease 
attacks leaf, leaf stalk, stem, tendrils, fruit buds and blossoms.” 
The spots on the stems, which later become white in the center, 
are said not to cause any very serious damage. 
It is further stated that “the fungus causing the above 
trouble is a member of the genus Phyllosticta, although from 
the character of the sporules, which are sometimes uniseptate 
and hyaline, it is questionable whether it might not, following 
Saccardo, be classed as an Ascochyta.”® The following descrip- 
tion and name are given: “ Phyllosticta citrullina, n. sp. Spots 
circular, irregular, black, concentrically ridged, becoming con- 
fluent. Pycnidia amphigenous, brown, immersed, scarcely 
erumpent, membranaceous, lenticular 75-131 mp, average of 
many measurements 107 » x 67 mw. Sporules 9-10.7 p, average 
about 10 » x 3.5 mw, generally continuous, sometimes uniseptate, 
4 Del. Exp. Sta. 5th Ann. Rpt. pp. 75-9, (1893). 
Ea ORS «Ray hos 
° Blight of watermelon vines—Bul. Torr. Bot. Club 18: 373-4, (1891). 
BM Ge Doo lo. 
8]. c., p. 374. 
