Types of Garden Enemies
Fig. 17
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 current recommendation.

Fig. 18
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 bodies.




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