XATUEAL COXTROL OF CITRUS MEALYBUG IN FLORIDA. 



13 



the fungus were counted either that da}' or the da}^ following. The 

 remaining insects were then counted. jDlaced 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. Yotliers, 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 meah^bug 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, maj be regarded as a 



