FLOEIDA. 91 



of the output increases each year. The station now has a creditable 

 farm equipment, but is still handicapped by lack of sufficient funds 

 and laboratory room and facilities. 



FLORIDA. 



Agricultural Experiment Station of Florida, Gainesville. 



Department of the University o£ the State of Florida. 



P. H. Rolfs, M. S., Director. 



There were no changes on the staff of the Florida station during 

 the past year, but since its close E. W. Berger, who resigned as sta- 

 tion entomologist to become State inspector of nursery stock, was 

 succeeded by J. R. Watson; Mrs. E. W. Berger was succeeded by 

 W. Voorhees as librarian, and O. F. Burger was appointed assistant 

 plant pathologist. 



Satisfactory progress in the Adams fund work of the station was 

 made, and some of the results were published during the year. The 

 plant pathologist reported considerable progress in the studj^ of the 

 scalv bark disease of citrus trees in Bulletin 106 of the station. The 

 fungus Cladosporium herbarum citricolum was isolated repeatedly 

 from diseased spots, and when inoculated into sweet orange trees 

 was found to produce the early stages of the disease. Constantly 

 associated with this fungus was the wither-tip fungus {CoUeto trie hum 

 glceosporioides) ., and this is considered an important secondary agent 

 in the destruction produced by the disease. Heading back the orange 

 trees during the dormant period and spraying five to six times with 

 Bordeaux mixture or treating the bark or cut surfaces with carbo- 

 lineum proved sufficient means for the control of this trouble. The 

 spotting of the fruit was completely prevented by spraying with Bor- 

 deaux mixture. 



Special attention was given the past season to the stem-end rot 

 of citrus fruits. The causative organism had already been isolated 

 and subsequent inoculation experiments showed the probable correct- 

 ness of the conclusions relative to the cause of the disease. In con- 

 nection with life-history studies it was ascertained tliat the fungus 

 causing stem-end rot was in the orchard during practically the entire 

 year, being found in partially decayed branches and twigs when the 

 fruit Avas immature or not in the groves. Some shipping experiments 

 in cooperation with this department were begun to determine the 

 effect of the disease on marketed fruit. In connection with this work 

 a second fungus capable of causing a very similar disease was dis- 

 covered. Work on gTimmosis was continued and the organism Di- 

 flodia natalensis Avas found to be the causative agent. Through 

 inoculation experiments it was determined that the disease is not 



