1042 DISEASES OF VARIOUS CROPS 



The other Septoria coukl not be identified with any hitherto known form 

 and is described as a new species under the name cf Septoria Apii graveolen- 

 tis n. sp. 



The symptoms of the disease are very varied : i) inconspicuous hght 

 yellow spots, diameter 0.5 to 3 mm, the pycnidia spread over the entire 

 leaf on the spots and outside, separately and in groups ; 2) spots of vague 

 outline, reddish- yellow in colour ; the pycnidia, few in number, are first re- 

 stricted to the leaf tissues, afterwards partly emerging ; ]) round spots, 

 dirty yellow, maximum diameter 5 mm, in which the pycnidia are situated; 

 4) dark chestnut spots, lighter towards the centre, strewn with pycnidia. 



Both with Septoria Apii (Br. and Cav.) Chester var. Magnusiana and 

 S. Apii graveolentis n. sp., the disease begins with the lowest leaves; these 

 turn yellow without completely withering or drying up. Weather condi- 

 tions hav'e some influence on the growth and spread of the fungus. After 

 a severe epidemic in 1913, the disease reappeared in the summer of IQ14, but 

 disappeared almost at once owing to the drought which prevented germina- 

 tion of the spores. 



The Septorif! have no type of fnictification ether than the pycnidia. 

 The latter form during the summer, but their spnies retain their germinating 

 capacity through the winter and .spring. Infected leaves and other vege- 

 trble debris remaining on the ground may thus become the source of an 

 epidemic in the following year. The pycnidia also develop in the seeds. Thej' 

 contaminate the young plants from the latter, and eventually, after an in- 

 cubation period of three or four weeks, produce the characteristic degenera- 

 tion of the leaf in the already transplanted and growing plants. 



The following means of control are advised : i) careful and thorough 

 examination of seeds ; 2) treatment of seeds with dilute formalin, strength 

 1 : 300, for 2 hours; 3) removal from seed plots and destruction of all young 

 plants showing light yellow streaks ; 4) picking off the diseased leaves dur- 

 ing the summer and pulling up the entire plant in case of very widespread 

 and marked infection ; 5) gathering and destruction of all vegetable refuse 

 after the crop. 



Finally, attention is drawn to the fact that this refuse nrust not be used 

 as manure, even if the infection was very slight and only involved a small, 

 number of plants. 



817 - A New Disease of the Bamboo caused by Scinhia bambusae n. sp., in Italy. 



— TtJRCONi Malusio ill Rendiconti delle scdute delta Kealc Accademia dei Liiwei, Classe 

 di scienze fisichc, matcmatiche c naturdli, 5th Series, Vol. XXV, 1st Half -Year, Part 7, 

 pp. 528-532. Rome, April 2, 1916. 



In a plantation of Bambusa mitis Poir. in the Botanical Gardens of Pa- 

 via, during the summer of 1914 the branches were wholly or partially dried 

 up, whitish in colour and showed a number of small black blisters. The first 

 symptoms of the disease appeared on branches and twigs of all sizes, prefer- 

 ably at the tip, chiefly on the small branches carrying leaves. Small 

 brownish spots or streaks appear and these afterwards spread and combine, 

 forming blotches which finally occupy several intcrnodes. The di.seased 

 parts, which are brown at first, gradually turn whitish and dry, becoming 



