76 NATURAL CONTROL OF WHITE FLIES IN FLORIDA. 
Climatic conditions in control of white flies. 10 
Coccinellid, undetermined small black species, enemy of citrus white fly 9 
Coccus hesperidum, host of Verticillium heterocladum 37. 38 
Coniothyrium sp. , parasite of JEgerita webberi 32 
Cryptognatha fiavescens , enemy of citrus white fly 9 
Cycloneda sanguinea, 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 Aleyrodes fernaldi 8 
tested as to ability to parasitize citrus white fly 8 
variegata, parasite of Paraleyrodcs perseas 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 59-60 
disadvantages accruing to citrus trees through 
their use 69-70 
efficacy, comparative, of different species 46-47 
credibility of common reports 39-40 
increase bv spreading infections 61-68 
natural. ._■ 39^*7 
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 60-61 
injury, indirect, from their use, through disuse 
of needed fungicides 69-70 
to foliage through their use 69 
mycelia, water mixtures, application. . 51-53 
preparation 50-51 
pustules, advantages of soaking before shaking 
or stirring 54 
number 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 
by 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 
