GLOEOSPORIUM. 483 



bonate or potassium sulphide solutions has good effects on the 

 yield of the orchards. In vineyards under treatment for black- 

 rot or mildew, there is little chance of the ripe-rot fungus 

 appearing. 



It is probable that the species known as Gl. phonioides 

 Sacc. on tomato, Gl. piper ahbm E. et E. on peppers {Capsicum 

 annuum), and Gl. melangeae E. et Hals, on the egg-plant, are 

 identical with Gl. fructigemim. At least they very much 

 resemble each other, even on their widely differing substrata, 

 and cross-infections have been carried out. 



Gl. venetum Speg. (Gl. necator Ell. et Ev.) Anthracnose of 

 raspberry and blackberry.-^ This disease appears on both canes 

 and leaves. On the young shoots it produces small reddish- 

 purple spots during early summer; as the season advances the 

 spots run together into irregular blotches of more or less 

 greyish colour with a dark purple margin. The ripening fruit 

 remains small and shrivels up. Leaves may also bear spots, 

 but they more frequently remain smaller and have an unhealthy 

 look. The conidia are at first enveloped in a thin covering, 

 which becomes gelatinous when wet, so that they escape. The 

 mycelium is believed to perennate in stems or decayed remains, 

 and so to carry the parasite from season to season. Owing 

 to the delicate nature of raspberry foliage, fungicides must be 

 used with great care. Dilute Bordeaux mixture is said to be 

 safe and beneficial. The burning of diseased canes should 

 certainly be carried out each autumn. 



Gl. ribis (Lib.). This attacks currant bushes throughout 

 Europe and America in much the saiiie way as Gl. venetum. 

 The leaves wither and fall, so that the fruit-crop suffers. 

 (Britain.) 



Gl. amygdalinum Brizi.^ This has recently been described 

 as destructive to almond cultivation in Italy. The mycelium 

 inhabits twigs and fruits, and gives off tufts of conidiophores 

 bearing conidia ; as a result, wounds are produced in the 

 epidermis and stunting of the host-tissues takes place. 



Gl. rosae Hals, is described as injurious to rose-culture in 

 America. It may be identical with some of the species of 

 G-loeosporium already mentioned as frequenting Eosaceae. 



' U.S. America Dept. of Agriculture, Report for 1889, contains a good account. 

 ^Brizi, Zeitsch. f. Pfianzenlcrankheiten, 1896, p. 65. 



