widely distributed by shipping nursery stock or cuttings (500, 
ID) 
Field Key to the Genera of Scale Insects Based Principally 
on Host Plants 
1. Restricted feeders on specific host plants 
General feeders found on a variety of plant hosts 
2. On conifers ... ad Se cngte 
On hardwoods (see appropriate host). 
Beech branches and trunks; mature female oblong, 
1 mm. or less, yellow, body covered with white, 
WO Oly aRWia Xie. a0 we | ‘Cryptococcus 
Celestrus or euonymus leaves and stems, female ob- 
long, broadened posteriorly, dirty gray to nearly 
black, small white male scales usually abundant 
and conspicuous in clusters on leaves 
Unaspis euonymer 
Elm bark, branches and stems; mature female oval, 
about 2 mm., red-brown body with white waxy 
fringe about margin _ . _..Gossyparia 
Horse chestnut twigs and branches, mature female 
oblong, 1 to 2 mm., dark gray to black with lighter 
border... Aspitiotus, in part 
Magnolia twigs and branches, mature female round 
or slightly oblong, about 1 cm. in diameter, rich 
dark brown, very convex .. 3 Neolecanium 
Maple: 
On leaves. Mature female 4 mm. or more: 
Dark purplish, large white egg sac with 2 
longitudinal grooves and several transverse 
KId@eS = | Pulvinaria 
Yellow, body covered with large white cot- 
tony mass of wax thread. On sugar maple 
Phenacoccus 
On stems and branches (Southern States). 
Mature female round to oval, about 2 mm. 
gray, dark nipple concentrically placed 
Chrysomphalus 
Wwe bo 
Oak: 
Mature female gall or berrylike in shape, 3 to 4 
mm. in diameter, brown with mottling. On 
twigs and sometimes on leaves Kermes 
Mature females nearly round, 1 to 1!4 mm. in 
diameter, reddish-brown, body covered with 
translucent greenish wax “‘test,’’ causes small 
craterlike or pitlike galls on twigs, branches, 
and stems. Various species of white oak group 
Asterolecanium 
Pecan branches, stems and fruit in Southern States, 
not producing red coloration under infested bark; 
mature female round to oval, about 2 mm., gray, 
nipple concentrically placed Chrysomphalus 
Yellow tulip twigs and branches, sometimes on mag- 
nolia and poplar; mature female hemispherical, 5 
93 
