Plant Diseases. 53 



Potato (Potato-rot or Blight) , continued. 



Remedy. Spray the tops with Bordeaux mixture, or othe: 

 fungicide, upon the first indication of the blight. 



The tubers should be stored in a cool and dry place 

 Dusting them in the cellar with dry air-slaked lime is to be 

 recommended. Subjecting the tubers to a temperature of 

 105 to 110 for a few days will destroy the fungus and will 

 not injure the tubers for planting. 



Quince. LEAF-BROWNNESS (Entomosporium macula turn, 

 Lev., var. Cydonia, Sacc.). The leaves become spotted 

 and then turn yellow and fall, often causing considerable 

 damage. No remedies are known. It is nearly identical 

 with leaf-brownness of the pear (which see). 



RUST. See under Apple. 



Raspberry. CANE- RUST or ANTHRACNOSE (Glceosporium 

 necator, E. & E.). The spots or patches of fungus appear 

 on both the canes and leaves. The disease attacks the 

 base of the canes first and spread upwards. In Illinois 

 and Missouri it has been very destructive. 



Preventive. Give plants an abundance of light and air 

 by broad planting and high training. 



Remedy. Spray early in the season with sulphate of 

 iron, and follow later with Bordeaux mixture. Burn all 

 canes which are past recovery. 



RED or ORANGE RUST (C&oma luminatum, Link). 

 Attacks the under surface of the leaves of black and 

 sometimes red raspberries, and of blackberries, in patches 

 of whitish yellow, but the fungus finally covers the 

 whole under surface with an orange-red coating. 



Preventive. Plant such varieties as are least susceptible 

 to attack. Among blackberries, Kittatinny is particularly 

 susceptible. 



Remedy. Burn the plants, roots and branch, as soon as 

 the disease appears. 



Rose. LEAF-BLIGHT or BLACK-SPOT (Actinonema roses, 

 Fries). Attacks the full-grown leaves, first appearing as 



