108 



Pomona College Journal of Economic Botany 



Bordeaux mixture we kill this friendly fungus and thus allow the scale insects to 

 increase with unusual rapidity. 



Our best method in Florida consists in thorough orchard sanitation followed 

 by vigorous pruning out of the withertip affected branches. This pruning out is 

 done most profitably during July and during January. It is during these months 

 that our trees are pretty certain to be in full dormancy. Pruning out for withertip 

 when there is much new growth present is a very bad practice since every scratch 

 on the leaves or abrasion on the young growtli makes it very liable to withertip 

 infection and the spores must be present in the infected groves by the myriads. 



