GROUND MEALYBUG (Rhizoecus terrestris).
A California pest, sucking
roots of Kentia palms, boxwood, privet, chrysanthemum, and other
ornamentals. Drenching the soil with dichlorethyl ether (21/2 teaspoons to
1 gallon of water) has been recommended.
LONG-TAILED MEALYBUG (Pseudococcus adonidurn).
Widely distributed in
greenhouses and outdoors in warm climates, feeding on avocado,
citrus, and many ornamentals. There are 4 pencil-like filaments at the
end of the body and as long as the body, perhaps longer. Females give
birth to living young.
MEXICAN MEALYBUG (Phenacoccus gossypii).
Especially serious on chrysanthemums, often causing stunting and distortion of leaves, occa-
sionally attacking leaves, stems, and flowers of coleus, gerbera, fuchsia,
and calendula. This is a short-tailed mealybug, blue gray, covered with
thin powder. I have had good luck spraying chrysanthemums in a client's
greenhouse with TEPP, a poison to be used with caution.
TAXUS MEALYBUG (Pseudococcus cuspidatae).
This is prevalent on yew in
New Jersey, New York, and Connecticut, probably elsewhere in
the Northeast. I have seen shrubs so infested that when branches were
parted the insects fell down in a white cloud, but ordinarily they are
hard to see unless you closely examine stems and branch axils. Young
nymphs winter in bark crevices and on maturing in June give birth to
living young. There may be two or three broods.
Control. In my practice I have killed these mealybugs rather easily by
spraying the interior of the bushes with nicotine sulfate and soap, or with
Volck, 1 to 50 dilution, or with TEPP. DDT has been suggested but may
lead to other problems.
Mealy flata (Ormenis pruinosa and 0. septentrionalis) are also called
fulgorids, lantern flies, and lightning leafhoppers. Under any name, they
are far more disturbing to gardeners in late summer than they are injurious to plants. Young nymphs feed on wood and herbaceous stems-box-
wood, viburnum, and many other shrubs and some perennials. They are
enveloped in a great cloud of white woolly matter which causes gardeners
to worry about their being mealybugs or woolly aphids, but actual damage
is very slight. Adults look like very large leafhoppers. One species is pale
blue green, the other brownish covered with white powder. There is little
point in control measures.
Midges are related to flies; they are very small, 2-winged insects in the
order Diptera. Many species cause galls on plants, some kill buds.
CHRYSANTHEMUM GALL MIDGE (Diarthronomyia hypogaea),
pest now found rather frequently in gardens as well. Small cone-
shaped galls project from upper surface of stems and leaves (Figure 37C).
In severe infestations the leaves are dwarfed and curled, the stems twisted,
and flowers deformed and stunted.