56 EXPERIMENT STATION RECORD. 



Experiments conducted for the repression of club root of cabbage 

 consisted in applying various quantities of lime to the soil. From a 

 practical standpoint the application of about 90 bu. per acre seemed 

 to give the best results. It is probable the lime should be applied 2 

 or 3 months before planting. When these applications have been made 

 for 2 or 3 years in succession, it is very probable a smaller quantity 

 will be required for the prevention of club root. The experiments 

 show that the application of lime will prevent injury to cabbage by the 

 club root if grown year after year on the same soil, yet such a practice 

 is not to be recommended. A proper system of rotation should be 

 adopted so that cabbages or other cruciferous plants should not follow 

 each other oftener than once in 3 years. 



An experiment is reported in which it appeared that the soil was 

 infested by scattering the refuse and leaves over the ground. This 

 practice should not be followed. Oare must also be takeu with the hot- 

 bed in growing seedling plants, and no soil should be used that has 

 ever grown plants subject to club root. As an additional precaution 

 a small quantity of air-slacked lime should be mixed with the soil in 

 making the hotbed. 



Experiments are reported upon spraying tomatoes for the prevention 

 of "black rot," and the results seem to indicate that "black rot" is 

 chiefly caused by Macrosporium tomato, and can probably be controlled 

 by the Bordeaux mixture. 



Beginning when the blossoms appear, plants should be sprayed at 

 intervals of 10 days until the fruit begins to ripen. The disease is most 

 severe in dry weather. 



Another disease, which is due to Gylindrosporium sp., has been quite 

 destructive to the foliage of the tomato, and for this applications of 

 ammoniacal copper carbonate are recommended. 



The author describes a disease of Norway maples which seems to 

 affect the young plants, causing the destruction of mauy of them. The 

 cause of the disease is a fungus. Glceosporium apocryptum y and the author 

 says there is good reason for believing it may be prevented by appli- 

 cations of Bordeaux mixture. 



Descriptions are given of witches' brooms on cherry trees which are 

 caused by Exoascus cerasi. The appearance of the disease upon the 

 foliage which later results in the formation of the well-known " witches' 

 brooms" or "hexenbesen'' is fully described. In case the disease shows 

 atendency to become troublesome, the catting out and destruction of the 

 " hexenbesen" before the spores come to maturity is recommended. This 

 can be easily done, since the diseased twigs are said to be indicated by 

 a red color at least a week before the spores mature. 



Some notes are given on Rvobasidium pecJcii, a well-known fungus 

 which attacks many plants of the Ericacea*, producing conspicuous 

 enlargements of the branches, leaves, and inflorescence. While col- 

 lecting material for the study of this fungus another was found on 



