NATURAL CONTROL OF CITRUS MEALYBUG IN FLORIDA. 
13 
the fungus were counted either that day or the day following. The 
remaining insects were then counted, placed in pill boxes with fresh 
grapefruit rind, and the boxes placed in a moist chamber. Dead 
specimens were removed daily and counted. They were removed, 
furthermore, before the fungus fruited, in order to eliminate the 
chances of new infections arising within the pill boxes from the dead 
Fig. 2. — " Mealybugs on grapefruit following Bordeaux and oil emulsion for citrus scab. 
Mealybugs may be equally as abundant when Bordeaux and oil are not applied but 
such infestations are rather rare." Yothers. (Photograph by W. W. Yothers. 1920.) 
specimens. After one week, which was considered ample time for all 
field infections to become evident, the experiments were closed. 
When, as occasionally occurred, a mealybug was collected in which 
Chrysoplatycerus was found, it was removed, but ignored in the 
count, the number of such specimens being too small to influence the 
total mortality either one way or the other. 
The results of the various collections are diagrammed in Figure 1. 
It is believed that the progress and increasing rapidity with which 
the disease spread, as shown in this figure, may be regarded as a 
