Control. Spray with lindane, 1 tablespoon 25% wettable powder or 1
teaspoon emulsifiable concentrate per gallon of water, or with chlordane,
heptachlor, aldrin or dieldrin. DDT kills the lace bugs but increases red
spiders. One thorough application in late May should give good control
but there is reinfestation from untreated bushes in the vicinity so repeat
spraying may be necessary.
AZALEA LACE BUG (Stephanitis pyrioides).
This is always a problem on
azaleas, and more of one on the evergreen varieties, most of whose
leaves have lost their color by midsummer. They are coffee colored or
grayish, bleached or stippled, with the tell-tale brown specks on the underside. The dark, spiny nymphs hatch from eggs along the midveins in
late May or early June in New Jersey, February in Alabama. The adult
is Y& inch long with black and brown markings on its lacy wings. There
are two or more generations, with the bugs sucking late into the fall. If
you don't control the first brood before color is sucked out of the leaves,
there is no way to make your shrubs look decent again that season.
Control. In the South, summer oil and nicotine has been standard control, applied in spring after blooming, at the end of May, and in late
September. In the North, Black Leaf 40, 11/2 teaspoons plus 1 ounce of
soap per gallon of water, has been in general use, the first spray applied
in early June, but repeated several times during the season. DDT kills
lace bugs but increases southern red mite on azaleas. Lindane is the
HAWTHORN LACE BUG (Corythucha cydoniae).
Rather common on English hawthorn, other thorns, and cotoneaster, sometimes on Japanese quince, and increasingly prevalent on pyracantha as one goes South.
There is conspicuous white stippling on upper leaf surface and the dark
conical eggs are grouped on the underside. The nymphs are very spiny,
and I have met them working as early as February in Georgia.
OAK LACE BUG (Corythucha arcuatd).
Sometimes so numerous that most
of the leaves are white. The adults have quite light wings, shaped
like those of the sycamore lace bug (see Figure 18).
RHODODENDRON LACE BUG (Stephanitis rhododendri).
It is scarcely possible
to grow rhododendrons in full sun without having the leaves turn
yellowish from lace bug sucking. Rhododendrons in shade are less affected, with leaves showing an occasional white stippling. The eggs, found
along the midrib covered with brownish scabs, hatch in late May (in New
Jersey) into small spined nymphs, with light and dark areas on their flat