TROPICAL FRUITS 185 



The brown rot is found in its purest condition on the 

 fruit in the orchard, especially the fruit on the ground or 

 hanging low on the tree. It is most prevalent in wet 

 weather or on low ground after irrigation. The fungus is 



Fig. 79. — Brown rot of lemons, showing white growth of the fungus. After H. E. 



Smith. 



visible to the eye in the packing-house, as of a mass of 

 white filaments. It is spread by contact alone. 



Orchard infection can be controlled by the use of a 

 heavy mulch under the trees, either straw or a heavy cover 

 crop. In the packing-house the use of disinfectants in 

 the washer prevents trouble; one and one half pints of 

 formalin in the morning, and 1 pint at noon, or 1 pound of 

 bluestone in the morning and 8 ounces at noon. 



Scaly bark. — Small, circular or oval, rusty-colored bark 



