372 



STATE BOARD OF AGRICULTURE. 



THE 8EPT0RIA* LEAF SPOT J)1S1:ASI': OF 0I:LET{V Oil OELEiJY 



JU.IGllT. 



Special Bulletin No. 77. 



BY G. II. COONS AND EZRA LEVIN. 



IIOAV TO TELL THE DISEASE. 



Septoria leaf spot or 'T.lij>lit" shows fiisl as Itrown, dead spots on ilie 

 leaves. These spots are soon specked with dots which, tlioii.oh small, 

 are easily seen witli the naked eye. (See froniispiece.) With li.nlit at- 

 tack there may be only a lew spots on liie leaves, and tlie celery hnnclies 

 aie only sliji'litly dislif>nre(l. In a weak market, hnyers cnt the ]>rice 

 5 to 10 cents ])vv crate for this condition of the tops, llowevei', Avith 

 severe attack, the leaves wither and die. and the stems nuM'ely shrivel 

 and fall down. The disease begins on the older, outer leaves, passes to 



4;'l-^ 



'\) 



Fig. 2. The diseased leaves in early and late stages. 



*Called Septoria leaf spot because the disease is caused by a fungus, Seploria apii. 



