ss 



Preveiiliic and Rcnwdial Measures. 



1. When the disease is present in its worst form, the only certain method 

 of arresting its progress is to cut off and burn all the infected rosettes of leaves. 

 The cut should be made about two inches behind the tuft of leaves. Trees that 

 have been treated in this manner throw out healthy branches and remain free 

 from the disease. 



2. When the disease appears in a mild form on the scattered leaves the 

 tree should be sprayed with a solution of potassium sulphide (liver of sulphur), 

 one ounce dissolved in two gallons of water. 



Infection of the leaves only takes place when they ai'e quite young, and 

 then is the time to look for the mildew. On the first symptoms of its appear- 

 ance spraying .should be commenced. If this opiiortunity is neglected and the 

 mildew is allowed a start, spraying may be considered useless. 



3. It would, under all circumstances, be advisable to spray trees where the 

 disease had previously existed, commencing when the leaf buds are exiianding. 



4. No definite proof is as yet forthcoming as to whether insects assist in 

 distributing the spores of the fungus, or aiding in its atack in any other way. 

 It is. however, quite certain that mildew is most abundant on trees that are 

 infested with "woolly aphis" and "green fl.v" : consequently, these pests 

 should be dealt with. — Board of AgricuUiire and Fisheries of Eni/lund, Leaflet 

 201 



Apple I'owdeky Mildew. 



The most serious injury to the seedling, caused by this disease, is the loss 

 of its foliage. To prevent this, and thereby insure good working stocks for 

 buds, spray the seedlings witli the ammoniacal copper carbonate solution, first 

 when the leaves are about half-grown and thereafter at intervals of twelve 

 days. Following this plan, three sprayings will usually be made before 

 budding, and at least two after this operation, making five in all. It is seldom 

 that powdery mildew proves serious to budded or grafted stock, except upon 

 certain particularly .susceptible varieties. In such cases, practically the same 

 line of treatment recommended for the seedlings may be followed. — B. T. 

 Oalloway, V. S. Circular So. 10. 



Anthracnose of R.\spBERRy AKD Blackderry (Ohtsporium renetinii, Speg.) 



The anthracnose of raspberyy and blackberr.v is a common disease of these 

 plants and one which is capable of doing much harm. It affects the canes 

 first, later appearing also on young shoots and leaves. The spots in the early 

 stages of the disease are purple, but as the disease progresses these spots 

 acquire a whitish centre and become somewhat sunken. In bad cases the 

 spots run together, sometimes encircling the cane; at other times they run 

 along one side, producing large patches of a gra.vish colour. Diiring the 

 second season the spots tend to dry out, producing cracks in the wood and 

 scaling of the bark. On the leaves the spots are apt to he small, but numerous, 

 and follow the general appearance of those on the canes. The effect of this 

 parasite is to reduce the vigour and size of all parts of the plant. The fruit 

 often fails to mature properly, but frequently dries up before ripening. 



