15U 



lesion. Later the disease became rather prevalent in the field. In central 

 Indiana early blight did not become a serious factor but about Paoli it 

 assumed some importance late in the season. August 8th. there were found 

 in the fields near Paoli numerous spindling plants which showed a dry 

 blackened stem lesion about the stem at and below the ground line. Whether 

 or not these plants were the result of using transplants with the elongated 

 stem lesions above noted is not known. 



Wilt caused by Fusarium lycopersici caused severe losses to certain grow- 

 ers and seems to be becoming more prevalent in the state. It was unques- 

 tionably the most serious disease of greenhouse tomatoes and numerous 

 instances of complete or partial crop failure due to this disease were 

 found in the Indianapolis region. Owing to the persistence of this disease 

 in the soil, its high virulence under greenhouse temperatures, and the ex- 

 treme susceptibility of the Bonny Best variety, the greenhouse situation 

 is especially deplorable. In the field crop in central Indiana, the wilt 

 occurred to a considerable extent locally in areas of various sizes and as 

 scattered infected plants in the fields. 



At Frankfort, August 14th., a field was observed in which there was a 

 large area of dead plants surrounded by a narrow zone of plants showing 

 all stages of Fusarium infection. An experimental field near Frankfort 

 was planted with seed from a large number of varieties and single plant 

 selections, one to each row. There were scattered plants in this field killed 

 by wilt, a few rather definite areas of wilt, and a single striking case of 

 one row, a single plant strain, showing practically 100% wilt. In a 100- 

 acre field of tomatoes near Indianapolis no wilt was found and the Paoli 

 region was practically free from the disease. Quite likely this disease, like 

 the Fusarium root diseases of cabbage and celery, is disseminated by 

 means of diseased transplants. 



Leaf mold caused by Cladosporium fulvum was exceedingly serious in 

 many greenhouses, the infection being so general in some instances as to 

 cause the death of the plants. The disease was at its height during the 

 ripening period of the summer crop and was favored by the high temper- 

 ature and humidity existing in the houses at that time. Leaf mold 

 appeared in epidemic form in the fall greenhouse crop at Lafayette and 

 Terre Haute. Bordeaux spray and sulphur dust seem to be ineffective as 

 control measures and a lime sulphur spray has been recommended. The 

 disease was found to a limited extent late in the fall in an experimental field 

 at Frankfort. 



A bacterial spot disease previously reported from Michigan^ as "canker" 

 was widespread and abundant in central Indiana late in the season. This 

 disease is characterized by conspicuous black lesions on the fruit and by 

 rather inconspicuous black lesions on the leaves, petioles and stems. The 

 black fruit lesions are very objectionable from the canner's point of view 

 and the disease assumed considerable economic importance this year. 



Buckeye rot of the fruit caused by Phytnphthora terrestria was found 

 in one greenhouse near Indianapolis. Oidy the lower fruits in certain areas 

 were affected. 



