Insects injurious to fruits . osphere,soon undergoes a change, assuming a dark, rusty appearance,which seriously depreciates the value of the fruit for the unaided eye the oranges appear dusty, but if examinedwith a magnifying-glass they will be seen covered with amultitude of mites of a whitish-flesh color. A weak alkaline wash applied to the fruit would doubtlessdestroy these mites. Another rust, known as the black smut, often spreads 390 INSECTS INJURIOUS TO THE OR A NO E. over botli leaves and fruit, making tlieni appear very is a minute fungous growth, known under
Insects injurious to fruits . osphere,soon undergoes a change, assuming a dark, rusty appearance,which seriously depreciates the value of the fruit for the unaided eye the oranges appear dusty, but if examinedwith a magnifying-glass they will be seen covered with amultitude of mites of a whitish-flesh color. A weak alkaline wash applied to the fruit would doubtlessdestroy these mites. Another rust, known as the black smut, often spreads 390 INSECTS INJURIOUS TO THE OR A NO E. over botli leaves and fruit, making tlieni appear very is a minute fungous growth, known under the name ofFumago salicina Farlow, but it is believed by some to resultfrom the punctures of insects, causing an exudation, on whichthe fungus thrives. As a remedy, use an alkaline solution of soap as strong asthe tree will bear without injury. No. 250.—The Purple Scale. Mytilaspis citricola Packard. This is one of the most common and injurious species oiscale-insect found in Florida. It is confined mainly to the Fig. leaves and fruit of the orange, and sometimes disfigures thelatter to such an extent as to make it unfit for market, yetit is often seen on fruit offered for sale. The scale of thefemale is shown empty at a in Fig. 400, and occupied by INSECTS INJURIOUS TO THE ORANGE. 391 the insect at b, both highly magnified. It is long, narrow,more or less curved and widened posteriorly, varying incolor from dark purple to reddish-brown, the enclosed insectbeing yellowish white. That of the male, shown at c, alsomagnified, resembles the female scale in form, but is nearlystraight, and may be at once distinguished by its smallersize. In color it is much the same as the female scale, but issometimes darker, occasionally dark brown or almost the leaf in the figure these scales are shown of the naturalsize. The eggs, which number from eighteen to twenty-five undereach scale, are white, and are arranged irregularly, as shownat b. They hatch in Florida about the mid
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