TREE INSECTS AND THEIR CONTROL 211 
SAP-SUCKING SCALE INSECTS 
Oyster-shell Scale 
(See description and remedies under Elm) 
San Jose Scale 
(See description and remedies under Ash) 
MAGNOLIA 
Habits This scale encrusts the 
and branches of the Magnolia and 
Damage. Tulip tree so thickly at times 
as to cause the tree to sicken 
and die. After spending the winter on the 
bark the scales feed there during the 
spring and summer and produce a new 
generation toward fall. In September the 
young insects settle so densely on the 
twigs as completely to hide the bark. At 
this time the young may be seen crawling 
about, preparing to settle. The fully 
grown scale is a vivid gray or light brown, 
knotty and prominently raised. The 
young scale is black. In addition to the 
damage caused by the feeding, the scale 
secretes an offensive honey-dew which 
invites fungus growth and clogs the pores 
of the leaves. 
Spraying is the best means 
of controlling this scale. The 
spray should be applied late in September, 
at the time when the young have just 
made their appearance. Ten per cent, 
kerosene emulsion has been found effec¬ 
tive, as has miscible oil solution. Winter 
spraying with undiluted crude petroleum 
is advocated by some authorities as an 
efficient means of control. 
SAP-SUCKING SCALE INSECTS 
Magnolia Soft Scale 
Remedies. 
MAPLE 
LEAF-CHEWING INSECTS 
Forest Tent Caterpillar White-marked Tussock Moth 
Bagworm Brown-Tail Moth 
(See descriptions and remedies under Elm) 
Green-striped Maple Worm 
Habits While not prevalent every 
and year, this worm does serious 
Damage, damage to the Maples at 
times and has been known to 
strip trees of all their foliage. The moth 
appears in May or June, an insect with 
woolly body, pale yellow, and having a 
wingspread of two inches. Eggs laid on 
the underside of leaves hatch into cater¬ 
pillars within ten days. The caterpillar is 
smooth, a pale yellowish green, and grows 
to be two inches long; it is striped length¬ 
wise with dark green and has long horns 
back of the head. The worm feeds on 
leaves. 
Remedies. Natural enemies, including 
birds and insects, serve to 
keep this worm in check for the greater 
part of the time. When a tree becomes 
infested it should be sprayed with lead 
arsenate as soon as the caterpillars make 
their appearance. Prompt action is need¬ 
ed to prevent destruction of the foliage. 
To pick by hand such caterpillars as may 
be in reach is helpful in ridding young 
trees of this enemy. 
