34 



THE CANADIAN HORTICULTURIST. 



also quite subject to it. This disease is due 

 to one of the low forms of fungus, known 

 as a slime mould, which occurs as a slimy 

 mass and gains access to the young foots 

 causing the well-known malformations. 



After the large club roots are formed, in- 

 numerable spores are produced and are set 

 free by the rotting of the roots and are left 

 in the soil, where they apparently remain 

 indefinitely continuing the disease from year 

 to year. 



The only way to check the disease is by 

 preventive methods, as remedies are unavail- 

 able after a crop is once infected. The best 

 way is to follow a crop rotation in which 

 none of the cruciferous plants, such as cab- 

 bage, cauliflower, turnips, or rape are grown 

 on the ground for several years. If this is 

 combined with clean cultivation, and no 

 weeds are allowed to off'er a host for the 

 continuation of the fungus good results will 

 follow. 



It has been said that lime, used at the rate 

 of 75 bushels to the acre, has been found 

 effective in destroying the spores in the soil, 

 but no reliable data upon this point are yet 

 obtainable. 



O. A. C, Guelph. H. L. Hutt. 



Blight of Qeranium. 



1267. Sir, — I send you in a box two leaves of 

 Angels Trumpet and some Ivy-Leaved Geraniums 

 which are affected with a blight which is new to 

 me. Am usually very successful with plants, and 

 can manage the living creatures but don't know 

 what to do with this. Sent for Ghishurst Com- 

 pound and sponged with it once, but don't think 

 it will do for from the larger of my two plants it has 

 cut off every leaf and bud. This house is stone 

 and we have sixty-five plants, and I am trying to do 

 a little business in the plant line, there being no 

 greenhouse here. 



Would you please tell me what this blight is, and 

 how to manage it. C. M. Hurlburt, 



Manito waning. Manitoulin Island, Ontario. 



The leaves of your Ivy-Leaved Geranium 

 are affected with a leaf-spot fungus known 

 as Cercospora. 



In the line of treatment, you should pluck 

 all the diseased leaves and burn them, then 

 at intervals spray the remaining plants with 



a dilute Bordeaux solution, made as follows : 

 Dissolve 4 tablespoonsful of Copper Sulphate 

 in I quart of hot water ; also dissolve 4 

 tablespoonsful of fresh lime in i quart of hot 

 water. Pour these solutions .together into 

 a pail containing i^ gallons of water. This 

 mixture, prepared in this way, loses its value 

 in a few days, so new solutions should be 

 made whenever • the plants require to be 

 sprayed. 



O. A. C, Guelph. W. Lochhead. 



Rose Buds Not Maturing. 



1268. Sir, — I have a Clothilda Soupert Rose 

 which has had only one flower ; buds form on it 

 but do not mature. Is this for want of nourish- 

 ment or too much or too little water ? It is regu- 

 larly watered, is healthy and free from insects. 

 Do such plants need rest in winter? 

 Yours truly, 



Simcoe. Willie Murray. 



As the rose plant in question appears 

 to be in a healthy condition as far as its 

 growth is concerned, the dry arid at- 

 mosphere of the house is probably the cause 

 of the buds not maturing. Roses like a 

 moist humid atmosphere to grow and flower 

 in. Sprinkle or syringe the plant with clear 

 tepid water two or three times a week, this 

 will help it. 



If the rose has flowered all the past sum- 

 mer and autumn, a rest will benefit it. This 

 can be obtained by placing the plant in a 

 cool temperature of about 40 degrees, and 

 giving it only sufficient water to keep the 

 soil barely moist. A month or two of this 

 treatment will not injure the plant. 



Roses, however, are not good house 

 plants. 



Hamilton. 



W. Hunt. 



Whale Oil Soap. 



1269. Sir, — Could you let me know where to 

 write for whale oil soap for spraying, and at what 

 price it can be obtained, and oblige. 

 Yours respectfully, 



Olinda. M. G. Bruner. 



Mr. J. J. Ward, of Consecon, Ont. , manu- 

 factures whale oil soap, and would be glad 

 to quote prices. Mr. G. E. Fisher, of Bur- 



