21 



ten or twelve days. In some cases the leaves are destroyed by this treat- 

 ment. Lime-sulphur wash applied in fall and spring while the plants are 

 dormant has also given good results and will probably become the standard 

 remedy. It is advisable also to give a thorough application after the fruit 

 is gathered. 



2. Currant Anthracnose. 



(Gloeosporium ribis, M. & D. Pseudopeziza ribis, Kleb.) 



This disease is a common one on both red and white currants, and is 

 sometimes found on the black currant and the gooseberry. It attacks 

 the leaves, petioles, canes, fruit and fruit-stalks. The most serious injury 

 is done by the premature falling of the affected leaves in July or August. 

 The disease causes a spotting of the leaves and slightly sunken light- 

 colored areas on the petioles and canes. The spores are one-celled and 

 curved in form. They are borne on short stalks which arise from a 

 denser portion of mycelium embedded in the tissue, the whole forming a 

 pustule. These pustules are abundant on both sides of the leaf, being 

 more numerous, however, on the upper surface. 



There has lately been discovered (1906) a winter-form of this fungus 

 in fallen leaves that have wintered over under suitable conditions. The 

 spores are borne in club-shaped sacs situated in a fleshy disc-shaped struc- 

 ture. Each sac or acus has eight oval spores. On account of the discovery 

 the name of the fungus is now known as Pseudopeziza ribis. The 

 winter, or ascospores, upon inoculation of growing leaves develop in time 

 the Gloeosporium or summer stage, as it is commonly recognized. 



Treatment — The dead loaves and rubbish should be raked and burned, 

 and two or three applications of Bordeaux — the tirst in June — will keep 

 the disease under control. 



3. Raspberry Anthracnose., 



(Gloeosporium venetum, Speg.) 



This is usually a more serious disease than the preceding one. It 

 attacks the canes and sometimes appears on the leaves and young shoots. 

 The presence of the fungus is readily recognized by the purplisli spots, 

 which later become grayish in the centre, presenting a bird's eye, effect. 

 These spots in severe cases become confluent, and girdle the stem, when 

 the fruit and leaves dry up and die for lack of moisture and plant food. 

 Macoun says that affected plants suffer most during the second season when 

 the disease has usually spread so much that a large proportion of the 

 canes and smaller stems are affected. 



