- 361 - 



the dry leaves with a sprinkling of straw or dry litter and burning 

 them. This may seem harsh treatment lor the plants, but every 

 one who has tried burning over a strawberry bed has been sur- 

 prised by the vigorous and healthy appearance of the new foliage. 



Leaf disease of celery. Board of Agricultural and Fisheries, 

 Leaflet No. 238, illustrated. London, May 1910. 



" Celery leaf spot " caused by Phyllosticta Apii, Halsted, was 

 first observed in the United States in 1891 and since then has re- 

 peatedly proved to be a destructive parasite on celery. The di- 

 sease which attacks the leaf is readily distinguished from the other 

 celery leaf parasites by the presence of one or more large blotches 

 on a leaf, which at first are dull brown, then paler, dry, and studded 

 with numerous black points or perithecia, each containing nume- 

 rous spores. When these are ripe they infect the soil endangering 

 the following crops. Numerous spores are also conveyed to ad- 

 joining leaves thus spreading the disease with great rapidity during 

 damp dull weather. 



A second celery leaf disease, caused by Septoria Petroselini, Desm. 

 has long been known. It studs the leaf with numerous, irregularly 

 angular brown spots, each bearing a few very minute black peri- 

 thecia, containing myriads of very slender needle-shaped spores. 

 When it attacks celery an epidemic usually results owing to the 

 rapid production and dispersal of spores. 



Preventive measures. Both diseases yield to the same treatment, 

 provided it be commenced at an early stage. On the first appear- 

 ance of the disease the plants should be sprayed with Bordeaux 

 mixture of: sulphate of copper, 10 Ibs. 4,54 kgs. 



quicklime 5 Ibs 2,27 



water 100 galls .... 454 



Three applications at intervals of a week usually prove sufficient 

 to check the parasite. 



E. J. SCHWARTZ. A New Parasitic Disease of the Juncaceae, 

 Preliminary notice. Annals of Botany. London, January 1910, 

 Vol. XXIV, N. 93, p. 236. 



" The root of various species vi Juneus vcs subject to the attack 

 of a Mycetozoan parasite, which the author proposes to call * Soro- 



