AGRICULTURAL EXPERIMENT STATION. 



155 



CHARACTERS. 



This disease makes its appearance 

 upon ripening or fully ripe tomatoes 

 upon the vines or develops rapidly 

 upon gathered fruit. It appears on 

 the tomatoes as rounded, sunken, dis- 

 colored, wrinkled spots with a black 

 centre. See Fig. 2. Contiguous spots 

 .become confluent forming diseased 

 areas. An examination of these dark 

 ■f Fig. 3. a fruiting tuft of Coiieto- parts in the diseased areas, discloses 



triehum phoinoides, Sacc.Tomato- 



Antbracnose. numerous microscopic, oblong bodies, 



the spores of the fungus. See Fig. 4. These spores reproduce 

 the disease. Prof. Chester found that these spores inserted under 



the skin of healthy tomatoes would rapidly 

 cause the disease. Not being able to 

 develop the disease by putting the spores 

 on the unbroken skin of the green and 

 ripe tomatoes would indicate that the 

 fig. 4. a. Mature spore. B. disease is an internal parasite and can 



■Germinating spore of Colleto- , . , , u . . ,, -n , 



triehum phomoides, Sacc. not be reached by spraying with Potassium 

 Sulphide as is recommended by Mr. Bragg of the Oregon Station 

 in a recent bulletin. 



This disease opens the way for the attack of other species of 

 fungi that hasten the decay. 



Fig. 3. shows a cross section of one of the diseased spots highly 

 magnified. 



REMEDIES. 



1. Spray the vines and young fruit with Potassium Sulphide 

 (Liver of Sulphur) — formula. — Dissolve seven ounces of Potassium 

 Sulphide in twenty-two gallons of water and apply with a spraying 

 apparatus. As stated above this may not be useful for this dis- 

 ease but is regarded a remedy for external tomato fungi. 



2. Gather all diseased vines and tomatoes and burn them. 



3. Change the location of the tomato patch if the crop has 

 been affected. 



4. Do not take seed for planting from diseased tomatoes. 



