206 A Note on Celery Leaf-Spot Disease 



dotted very closely over the whole of the diseased leaves which become 

 dull blackish-green in consequence, but the seedlings show, both on 

 cotyledons and on foliage leaves, yellow spots extending to the leaf 

 margin bearing the small black fruits of the fungus, and contrasting 

 markedly with the bright green of the healthy parts of the foliage. 



When the matter was first enquired into about 40 % of the commer- 

 cial " seed " samples examined showed the presence of the fungus, 

 now the percentage has risen to 90 % . The attention of seed-growers 

 and seedsmen in this country has been called to the extent to which the 

 infection has reached, and the danger to the crop from sowing seed 

 containing even a small number of infected " seeds," and it is to be 

 hoped that they will endeavour to produce " seed " free from infection. 

 Experiments have been begun to see whether the fungus can be killed 

 by immersing the " seed " in fungicides, as it no doubt can, and it has 

 been shown that consistent attention to spraying with Bordeaux 

 mixture (much more easily and safely carried out on plants grown for 

 seed than in the growing of celery for market) will control the disease. 

 It seems, therefore, probable that seed-growers have it within their 

 power to provide their customers with clean seed. 



It may be added that Celeriac, too, has fallen victim to the disease 

 with increasing frequency during the past two years. 



