FUNGOUS AND INSECT FRIENDS. 545 



Fungous Friends. Fungi can be successfully used, 

 to check the ravages of insects, only in those regions hav- 

 ing a moist climate and a season sufficiently long to per- 

 mit of their development. In Florida, Louisiana and the 

 Islands, fungi may be depended upon, to a certain extent 

 and in many cases to a very considerable extent, to control 

 injurious insects, but they would fail utterly in the arid 

 or semi-arid climate of Arizona and Southern California. 

 These regions must depend upon predaceous_and_j)arasitic 

 insects as controlling agents. Whether these same agents 

 can be as successfully used in the more humid regions 

 has not been entirely proven, though in one instance at 

 least they have. In some cases a combination of fungous 

 and insect control has been satisfactorily established. 



In Florida the control of the more injurious citrus 

 insects, the scales and their relatives, by means of their 

 fungous enemies has received more attention than in any 

 other portion of the world. None of these fungi, so far as 

 known, are introduced species, though some of them may 

 be. 



The principal fungous enemies of citrus insects in 

 Florida are the Red Fungus, Bphwrostible coccopfaila 

 Tul., well known through the work of Prof. P. H. Rolfs, 

 as an enemy of the San- Jose Scale (on peaches), the Gray 

 Fungus, Ophionectria coccicola E. and E., and the Black 

 Fungus, probably belonging to the Pyrenomycetes. 



Preying on the White Fly, Aleyrodes citri, are two 

 fungi, first brought prominently to notice by Dr. H. J. 

 Webber. These are the Red Aschersonia, Aschersonia 

 aleyrodis Webber, and the Brown Fungus. 



The Red Fungus, Sphwrostilbe coccophila Tul. 



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