DISEASES OF SPECIAL CROPS 



111 



adjacent cedar trees, and there produce swellings upon 

 the branches and twigs during the fall and winter. In the 

 spring, these give origin to long gelati- 

 nous horns, which consist of masses of 

 spores embedded in a matrix of jelly. 

 These spores upon drying are conveyed 

 to the quince tree by the winds, and 

 there produce again the quince rust. 

 The cedar is a necessary resting place 

 for this fungus dur- 

 ing the winter. 



The remedy there- 

 fore is, if possible, 

 to remove the cedar 

 trees from the neigh- 

 borhood of quince 

 trees. This will al- 

 most entirely pre- 

 vent the rust, 

 although in rare in- 

 stances a few spores 

 may be carried a 

 considerable dis- 

 tance. Reasonable 

 protection is secured 

 if all of the cedar 

 trees in the immediate vicinity of the orchard be removed. 

 In case the cedar is too abundant to permit of its complete 

 removal, resort must be had to spraying the leaves and 

 fruit of the quince trees with the Bordeaux mixture at the 

 time when the rust spores are expected to arrive; that is, 



