June 1, 19:0 



Decline of P seudomonas citri in the Soil 



215 



Table VII. — Percentages of infection on grapefruit leaves inoculated with l/l solutions 

 of three Florida soils at various intervals after the soils had been inoculated with P. citri 

 ayid had been held at two tnoisture contents 



o Wtiere two numbers appear for days they indicate slight differences ia the sampling periods for the 

 several series. 



In Table VIII two series, one set up June 12 and one July 8, 191 9, 

 are compared. Both were with soil from Orlando, Fla., of the same 

 type but collected at different times. The inoculum for each 6-inch 

 pot in the two series was from four potato cylinder cultures. The first 

 series was kept well watered. The second was dried overnight after the 

 original inoculation and kept air-dry thereafter. The percentages for the 

 first series are averaged for four similar pots and are based on 4,000 

 inoculated punctures; those for the second are for three pots and are based 

 on 3,000 inoculated punctures. These series were set up and conducted 

 for approximately the first two months by Miss Clara H. Hasse. 



Table VIII. — Percentages of infection on grapefruit leaves inoculated with graded dilu- 

 tions of soil solution at various intervals after the soil had been inoculated with P. citri 

 and had been held at two moisture contents 



