76 NATURAL CONTEOL OF WHITE FLIES IN FLORIDA. 



Page. 



Climatic conditions in control of white flies 10 



Coccinellid, undetermined small black species, enemy of citnisnvhite fly 



Coccus hesperidum, host of Verticillium heterocladum 37, 38 



Coniothyrinm sp. , parasite of jEger^ta ivebberi 32 



Cryptognalha flavescens, enemy of citrus white fly 9 



Cycloneda sanguined, enemy of citrus white fly 9 



Diaspis sp. , host of Verticillium heterocladum " 38 



on leaves of Euonymus americanus 38 



Dipping method for water mixtures of fungous spores and mycelia 51, 52-53 



Dropping from leaves in control of white flies 18 



Drought in control of white flies 19 



Encarsia luteola, parasite of Aleyrodcs fernaldi 8 



tested as to ability to parasitize citrus white fly 8 



variegata, parasite of Paraleyrodes -persese 8 



tested as to ability to parasitize citrus white fly 8 



Euonymus americanus, food plant of Diaspis sp 38 



Fungous diseases of white flies 20-73 



cost of introduction and spread 58-59 



degree of infection obtainable 59-00 



disadvantages accruing to citrus trees through 



their use 69-70 



efficacy, comparative, of different species 4(i-47 



credibility of common reports 39-40 



increase by spreading infections 01-68 



natural 39-47 



earlier estimates 40-42 



has it increased since their first 



discovery? 47 



observations and records 42-46 



practicability of increase 60-68 



improvement of conditions favoring their devel- 

 opment 60-6 1 



injury, indirect, from their use, through disuse 



of needed fungicides 69-70 



to foliage througli their use 69 



mycelia, water mixtures, application 51-53 



preparation 50-51 



pustules, advantages of soaking before shaking 



or stirring 54 



num1)er of times they can be used to 



advantage 54-55 



relation between abundance of white flies and 

 results in spreading infec- 

 tions 58 



weather conditions and infec- 

 tions 57 



spores, vitality, effect of copper sprayers thereon 55 



length .../. 56-57 



water mixtures, application 51-53 



as means of spread 50-53 



effect of adding nutri- 

 ents 55-56 



straining them 

 through cloth 



strainers 53-54 



sulphur waters 



thereon 56 



preparation 50-5 l 



spreading them 47-56 



1)V pinning and rubbing infected 



leaves ' 49-50 



water mixtures of spores and 



mycelia 50-53 



experimental methods 48-49 



experiments and observations. . . 53-56 

 history of work 47-48 



