266 



ON THE WHITE BUST OF CABBAGES. 



or noxious to escape the most careless. The present season has 

 been very productive of different kinds of blight. Scarcely a 

 bramble is to be seen which is not completely discoloured by 

 rust ; the withered aspect of the bean-crop has attracted general 

 notice ; not a row of garden peas but is covered with Erysiphe, 

 and the ravages of Botrytis infestans on the leaves and stems of 

 potatoes are unhappily too notorious and fatal. In my own 

 district nothing can have been more general, and in many cases 

 pernicious, or even destructive, than the white rust ( Uredo Can- 

 dida of authors) which is so common on cruciferous plants. 

 They have indeed several other parasitical enemies ; but this is 

 perhaps the most general, and extends its visitations either under 

 the same or under very slightly different types to several other 

 families of plants. It has been found on plants belonging to 



several divisions of Compositae, on Euphorbiaceae, Portulaceae, 

 Malpighiaceae, Chenopodiaceae, Convolvulaceae, Caryophyllaceae, 



