PEONY SCALE (Pseudaonidia paeoniae).
This scale, which is so injurious
to southern azaleas, and often to camellias, is scarcely noticeable.
It is merely a small brown hump on the bark, but when it dies and falls
off it leaves a conspicuous white circle (Figure 50D). Control depends
on killing the crawlers in late spring, and the spray must be accurately
timed-the end of May or first of June in Alabama. Parathion is excellent, but Volck is safer for you. Use 3 level tablespoons Florida Volck,
2 of powdered derris, and 1 teaspoon Black Leaf 40 to a gallon of water.
PURPLE SCALE (Lepidosaphes bec\ii).
A widely distributed citrus pest,
it also occurs on avocado, croton, eucalyptus, fig, olive, and yew.
The female is purplish brown, shaped like an oyster, 1/8 inch long. Foliage
turns yellow, fruit is stunted and ripening delayed. Usual control is a
summer oil, applied in May and July.
ROSE SCALE (Aulacaspis rosae).
This is rather common on climbing roses
that are not pruned back and increasingly prevalent on bedding
roses as we tend toward more moderate pruning, also found on raspberries and blackberries. Females have circular, rather dirty white shields
covering an orange-pink body and red eggs; males are long and thin,
pure white. Canes are often thickly encrusted near the base. There are 2
generations in New Jersey with crawlers in May and June and again in
Control. For roses a dormant lime-sulfur spray, 1 to 9 dilution applied
immediately after pruning but before buds break very far, controls this
scale much better than an oil, but the latter may have to be used when
roses are on painted trellises or fences or near houses. Cut out canes too
SAN JOSE SCALE (Aspidiotus perniciosus).
This is so named because it was
first discovered in San Jose, California; it is now found in every
state and on every type of host plant, being particularly injurious to
peaches, apples, and other fruits, killing trees if allowed to spread unchecked. Terminal twigs die first, the tree turns yellow and lacks vigor.
On fruit a small reddish area surrounds the scale. Females are very small,
circular, gray, waxy, elevated in the center into a nipple surrounded by
a yellow ring. The male is oblong to oval. Young scales are sooty black
and winter on the bark in that form; they mature and mate in spring,
give birth to living young. There are 2 to 6 generations a year with most
rapid increase in a hot dry season.
Control. Lime-sulfur, 1 to 10 dilution, is frequently used on peaches to
take care of scale and leaf curl in one operation. On other fruits a delayed dormant oil spray is more often used. DDT or parathion kills