PACIFIC MITE (Tetranychus pacificus).
Orchard trees, vines, and ornamentals along the Pacific Coast have foliage bronzed and webbed
with subsequent defoliation; fruits do not color and drop before harvest.
The mites are yellow to green or orange with black spots. Adults winter
under tree bark or under leaves and trash on ground. Sulfur or DN dusts
or parathion sprays are used by commercial growers.
PEAR LEAF BLISTER MITE (Eriophyes pyri).
Brown blisters, often growing
together, are formed on underside of pear and sometimes apple
foliage. The mites, 1/125 inch long, far too small to be seen with the
naked eye, are long and tapering. They winter in bud scales and infest
leaves as they develop in early spring.
Control. Spray with miscible oil or lime-sulfur as for San Jose scale.
PRIVET MITE (Brevipalpus inornatus).
Leaves of privet and Boston ivy
gradually turn yellow; blood-red eggs are laid on under surface of
SOUTHERN RED MITE (Paratetranychus ilicis).
A major pest of holly and
azaleas, sometimes camphor, eucalyptus, loquat, sycamore, and English walnut. The eggs and nymphs are red, the adults nearly black with
spiny hairs curling backward. They feed on both sides of the leaf, making
it look as if dusted with red pepper. Leaves often turn brown and drop.
There are several generations, with mites more abundant in the South in
cool seasons rather than in hot weather. This species flourishes on holly
and azalea as far north as New Jersey and New York. There, overwintered eggs hatch in late April with peak population in late May or early
Control. The phosphates parathion and EPN 300 give satisfactory control; Malathon should be useful.
SPRUCE MITE (Paratetranychus ununguis).
This evergreen pest is widely
distributed in the North Temperate Zone, very injurious to spruce,
arborvitae, juniper, and hemlock, sometimes to pine and yew. Eggs wintering at the base of needles hatch in April and May. The mites arc
spined, dark green to nearly black with pink legs. They spin a quantity
of webs between the needles which turn gray or brown in spruce, yellowish in juniper, and nearly white on hemlock. Spruces are apt to look
gray all over, an arborvitae hedge turns brown, and hemlocks appear
very pale. A generation can be completed in 17 days, and where DDT
has been used for mosquito control or shade-tree spraying there is a tremendous build-up of spruce mites with evergreens sadly disfigured.
Control. Two new miticides safe for the operator have proved very
effective against spruce mites. Aramite 15-W is used as a spray, 1 table-
spoon to a gallon of water. Ovotran can be used as a 10% dust or as a
spray, and is most effective against the egg stage. Aramite has a long
residual effect, and 2 applications may last the season.