TWO-SPOTTED MITE (Tetranychus bimaculatus).
This is the common red
spider found around the world on vegetables-beans, tomato, egg-
plant, onions, celery, melons-on almost all greenhouse and house plants
and a special menace to ivy, and always a threat to outdoor roses, phlox,
sweet peas, violets, primroses, hollyhocks, and other flowers. The adult is
1/60 inch long, pale yellow or green more often than red, with 2 dark
spots. It spins webs wherever it goes and gives underside of leaves a
rather mealy appearance while taking color from upper surface by its
sucking. Rose leaves turn gray or yellow, or have reddish margins, or
brown burned areas; they lose vigor and drop. Some polyantha varieties
are nearly defoliated by midsummer. Phlox leaves are usually yellow,
primroses often dry up. Mites increase rapidly in warm humid weather,
and plants with little air circulation are most severely infested.
Control. Drenching with water helps-a weekly bath for ivies and
other house plants, and occasional syringing with the hose to break webs
on garden plants. Malathon, safer phosphate than parathion or TEPP,
is now available for garden use, but I have had excellent results with
Aramite, adding i tablespoon to each gallon of my regular three-in-one
rose spray. Ovotran is also good and is included in several combination in
sprays and dusts currently available.
Moths belong to the insect order Lepidoptera. They have scaly wings
like butterflies but a heavier body; they do not hold their wings vertically, and they are usually night fliers. In the larval stage they are caterpillars, and some have been discussed under that heading.
ABUTILON MOTH (Anomis erosa) also called okra caterpillar. This is a
light-green semi-looper, nearly 11/2 inches long, feeding on okra,
hollyhock, hibiscus, and mallow. It can be readily controlled with lead
BROWN-TAIL MOTH (Nygmia phaeorrhoea).
A New England pest of apple,
cherry, oak, pear, plum, rose, and willow, sometimes on other ornamentals but not on evergreens. Caterpillars are reddish brown with a
broken stripe along the side, red tubercles near the rear, and are covered
with tufts of poisonous brown hairs which cause a rash if they touch the
skin. Many young larvae winter together in a single nest made of webbed
leaves at the end of a twig, feed in spring, and pupate in June in a
cocoon in webbed leaves. Moths, pure white except for a brown tip to
the abdomen, appear in July to lay eggs on foliage. Young larvae feed
on terminal leaves in late August.
Control. Cut off and burn winter webs; spray trees with lead arsenate
or DDT when leaves come out in spring and again in August as larvae
hatch. Infested areas are under quarantine.