
New York AGricurturaAL ExprrimMEnt SrArTION. 575 
CELERY SEPTORIA. 
Bar of the fungi which causes celery leaf spot or leaf blight is 
known to botanists under the name of Septoria Petroselini, Desm., 
var. Api: B. & C.* So far as could be determined most of the 
damage from celery leaf spot in 1892 in central and western 
New York was due to this Septoria. It was described as occur- 
ring on celery by Briosi and Cavara,§ Pavia, Italy, in 1890. 
In 1891 it was found by Chester** in Maryland, by Halsted§§ 
in New Jersey and by Humphrey]|| in Massachusetts. This fungus 
attacks not only the leaves but every part of the plant above 
ground. It causes watery streaks to appear along the stalks 
which resembled somewhat the bacterial disease but which in a 
few days become dotted with the fungus fruits. Its spores are 
borne in little globular receptacles, called pycnidia, which project 
slightly abeve the surface of the leaf and are visible to the naked 
eye as little black dots or pimples scatitered over the diseased 
surface. See Fig. 16. 
The leaf spot disease is illustrated in Fig. 12. An enlarged view 
of five pycnidia is shown in. Fig. 13 where they are seen projecting 

Fig. 12, Portion of leaf affected with’a celery leaf spot. (Septoria Petroselini, Desm. var. Apit, 
B. & C.) 
* Humphrey states in the 1891 Annual Report of the Mass. State Experiment Station, p. 231, 
that ‘So far as it has been possible to examine material and descriptions it appears that this 
‘form on celery is separated by no distinct features from the following previously described ones 

on Umbelliferse; Septoria Sii, Rob. & Desm., S. Cryptoteeniw, E. & Rau., S. Sanicule, BE. & FE, 
and S. Dearnessii, E. & EB! 
§ Funghi Parisitti Fascecola, vi, No. 144. 
** Bulletin Torrey Botanical Club, Dec., 1891, p. 372. 
§§ 1891 Annual Report N. J. Expt. Station, pp. 255-256. 
| 1891 Annual Report Mass, State Expt Station, p. 281. 
