LLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Fungous enemies of white flies Frontispiece. 



II. Hximidity and temperature records made by combined hygrograph 



and thermograph at Orlando, Fla 12 



III. Orange twig infested with citrus white fly, showing an effective 



infection of red fungus 20 



IV. Fungus-infected white flies: Red Aschersonia developing on Aley- 



rodes inconspicua infesting sweet-potato leaves; red Aschersonia 

 infecting the cloudy-winged white fly {Aleyrodes nubifera); red 



Aschersonia pustules, showing mycelium and pycnidia . . . ; 20 



V. Grapefruit leaf, showing yellow Aschersonia infecting the cloudy- 

 winged white fly 28 



VI. Rank growth of Cladosporium on yellow Aschersonia 28 



VII. Leaf showing brown fungus which developed on larvae and pupae of 

 the citrus white fly, film of mycelium partly torn from leaf and stem; 



Conothyrium on brown fungus 32 



VIII. (linnamon fungus, showing pustules and the dense whitish mycelium 



forming in places a feltlike covering to underside of leaf 36 



IX. Sporotrichum fungus infecting adult white flies, causing them to 

 remain attached to underside of leaf, instead of dropping as is 

 usual; larvieand pup* of the citrus and cloudy-winged white flies, 

 killed by fumigation and later developing the white-fringe fungus. . 36 



TEXT FIGURE. 



Fig. 1. Diagram of Gettysburg Grove; experiment in spreading red-fungus 



infection in an attempt to increase its efficacy 63 



6 



