DlSliASlvS OF \AKIOUS CKOl'S I04I 



815 - Ascochyta hortorum, a new Pest of the Artichoke in Italy. — Gabotto i,. in 



Rivisla di Fciloln-iu vf^iinlc, N'llth Year, No. 2. pp. 45- p'. Ptivia, ISIarch 1916. 



In February i()i(). the Author observed the presence of Jscoihyta 

 hoHlontin {>Speg.) Smith on artichokes from the ItaHan Riviera in the neigh- 

 bourhood of Genoa. The infested artichokes were only half the normal size- 

 and badly damaged. \n enormous quantity of brown pycnidia were found 

 on the scales attacked, on the peduncles and inside the rotting receptacles. 

 ]\Ian\ bacterial forms were combined with the fungus. 



A. horlorinn. already reported on several kitchen-garden Solanaceae (i), 

 had not been met with on artichokes. Apparently it has undertaken 

 the conquest of "nevv- hosts even belonging to different plant families, which 

 renders it still more formidable. 



816 - Septor/a Apii var, Mag-nusiana and 5. Apii-Graveolentis n. sp., 

 injurious to Celery in the Neighbourhood of Petrograd. — dorogix (V. in Muhu- 



ciiicpcDUin ■'}('. If. inhh.ii:/. Bhiiio jio M/hii.iiw/ii ii 'Pinnonamo.io^lii XHeHaio 

 h'o.uiiiiirwa. Mcnni'piii.thi no Miiho.mziu n 'l>it))in>iain():K)iiu Porciu. IVIinistr>- »f 

 Agriculture, Office of Mycolog\' and Plant Pathology of the Scientific Committee. 

 Materials relating to Mycolog>' and Plant Pathology, ist Year, Part 4, pp. 57-75- 

 Petrograd, 1915. 



In a garden near \'olkor, Petrograd. a large number of adult celery 

 plants were observed to be affected with a disease the most conspicuous 

 symptom of which is numerous spots on the foliage. In Jtily this disease 

 appeared sporadically on separate plots and beds, and in August the ap- 

 pearance of the diseased areas was very unsatisfactory. 



The diseased plants of the different groups presented such divergent 

 characters as to suggest many di.^tinct pathogenic agents. Microscopic 

 observations however only disclosed two species of Septoria, which are 

 dealt with in the present work. 



The plants attacked by the same parasite may present different symp- 

 toms according to cultivation or seasonal conditions, as was ascertained 

 b}- comparing one year with another or separate distant places, but in the 

 present instance the most divergent symptoms appeared simtiltaneously and 

 in the same place under quite identical conditions of environment for all 

 plants and groups. 



One of the Septoria might be identified with S. Mugnusiana All. ( —P/iyl- 

 daena Magnuaicma [All.) Bres.], but the writer, as a result of a careful 

 examination of the morphological and physiological characters, proposes 

 to regard it as a simple variant of 5. Apii [Br. and Cav.] Chester (= 5. Apii 

 [Br. and Cav.] Rostr.) ; we should thus have : Septoria Apii (Br. et Cav.) 

 Chester var. Magnusiuna (All.). 



The disease caused by this fungus occurs in three different aspects : 

 i) round red blotches, 5 to 10 mm in diameter, darker towards the edges ; 

 few pycnidia scattered in the blotches, towards the end of the leaves ; 

 2) ochre blotches, pale, bordered wi^-h yellow ; 3) greyish-white blotches 

 with many pycnidia. The blotches may sometimes be completely absent 

 and the p\cnidia gathered in small grou])s spread over the leaf surface. 



(i) S.-C /;. April 191 J, Xo. 7t5 (Kd.) 



