CEROOSPORA. 



Cercospora. 



Conidia elongated and slender, olive-green, and septate. M , - 

 celium greenish. 



"Distinguished by tin- vermiform septate c,,nidia" (Massee). 



Cercospora circumscissa Sacc. 1 Thi- is a parasite \\hich 

 occurs on cultivated almond, peach, and nectarine, as well 



nil wild 1'i-niiiix x<i-i>fin,i in the 1'niti-d Stai The lea\. 



attacked while still young, and exhibit by retlectcd li^ht a 

 yellowish spot with a dark centre. The cunidia ari-e on tin- 

 spots as dark-ureen clusters, thereafter the diseased tissue -brinks, 



become- detaeheil, and falls out, leaving " shot-holes " not 

 unlike those produced by specie- of PJii/lliistii-tn. \ . -foliation 

 may occur in severe cases of attack. A- a result of the 

 injury to the foliage, the new wood does not mature well, 

 and second growth may take place during the same season : 

 shoot- of this kind will probably dry up during \vint<T. The 

 fungus may also directly kill the tissue of t \\i-s aa far as the 

 cambium. The fruit is never attacked directly, but may be 

 -eriou-ly affected through the injury to Leaves or twigs. 



In order to minimi/e the disease, it is reeonmi'-nded to hum 

 all fallen foha^e, and to turn the earth thoroughly helnw infected 



, 



trees. I'ierce obtained a crown of very health}' foliage <ui almond 

 trees treated with (1) ammoniacal solution of copper carbonate, 

 and ( 1' ) modified can celeste. 



C. persicae Sacc. ' >n Leaves of peach. (I'.s. America. > 

 C. acerina Haiti-- appears on brown spot- mi the cotyledons, 



young Leaves, and sialk- of yniin- plants of Acer. The coiiidia 

 are grey, pluricellular, ami -li-htlv curved ( Kin. 314). Tin- 

 myi-eliiim inhabits the intercellular .-pace- ( ,f the part- attacked, 

 and forms n-.-tiirj -clo-oiia in the tlSSUCfi of dead h-a\ 



C. viticola (C< Thi- iun-u- is fi.iui'l in Kurope and ilic 



I'niied State.- <>n r/7/s vinifera and /'. /."/<// . It causes 



spot- .,11 the Leaves, and from ihc-e ai los lumn- "t 



-eptale rmiidioplini-es which give "If thick pluricellular c"iiidia. 



C. beticola Sac.-. 1 inflict- c.m-idcrahlc injury on culth 



Pierce, ./ urnal / '//, '///. \n., p. i;i; .nul p. 2 



l: llnti^', l',i>. , .iii-i,iiii, /, ,ni, ,/. /',,, I vii-li. 



' I tod ipl i"M :ni.| li.it in' lit in A 10 }'"/ ' I 



p. 24. 



'1'fninn ii, /'- Hi l:,iiii/'l'ini'i '/. /' ' h t - 



2K 



