EXPLANATION OF PLATES. 
Plate I. Healthy sweet orange tree.—A budded tree about 15 to 18 years old, growing 
on very sandy hammock, on shores of Lake Eustis, Fla. Photographed by H. J. 
Webber and W. T. Swingle, summer of 1894. 
Plate II. Blighted orange grove.—An exceptionally badly affected grove on shores 
of Little Lake Harris, Fla. On sandy hammock land. Twenty trees in succes- 
sion in the row shown were blighted. The nearest trees show the growth of water 
shoots from the trunk and lower branches. AIIl have been blighted from one to three 
years. Photographed by W. T. Swingle, summer of 1892. 
Plate III. Die-back or exanthema.—Fig. 1, an orange, two-thirds grown, affected 
with die-back, showing the characteristic sickly lemon-yellow color, the cracked 
apex, and reddish-brown stain. Fig.2, mature die-back orange, showing the reddish- 
brown stains. Fig. 3, 2-year-old orange twig, showing the eruptions which almost 
invariably accompany die-back. Fig. 1 painted by Miiller; figs. 2 and 3 painted by 
Miss D. G. Passmore. Natural size, 
Plate IV. Die-back or eranthema.—A tree of sweet orange (Cilrus aurantium) badly 
affected with die-back. The outer branches have died back and the new growth 
shows the characteristic large leaves. From a photograph by H. J. Webber, taken 
at Fort Mason, Fla., April, 1894. 
Plate V. Verrucosis or scab of lemon.—Shows leaves and one-third grown fruits 
distorted by the characteristic bumps and warts. Painted by Miss D. G. Passmore. 
Natural size. 
Plate V1. Verrucosis on sour orange and lemon.—Figs. 1-4, sour orange.—fig. 1, old 
leaf, seen from above; fig. 2, old, distorted leaf, seen from below; fig.3, very young 
fruit, showing warts on calix as well as on fruit and pedicel; fig. 4, one-fourth grown 
fruit, showing bumps and warts. Figs. 5-10, lemon.—fig. 5, one-third grown lemon 
slightly affected; fig. 6, one-fourth grown fruit, showing prominent bumps and warts; 
figs. 7 and 8, young lemons, showing bumps and warts; fig. 9, young healthy lemon; 
fig. 10, one-half grown lemon, slightly distorted. Photographed by W. T. Swingle 
April, 1894. About six-sevenths natural size. 
Plate VII. Sooty mold of the orange following the mealy wing (Aleyrodes citri).—Fig. 1, 
the sooty mold shows as a black covering on the fruit and upper surfaces of the old 
leaves. The larval scales of the mealy wing are shown on the lower surfaces of the 
leaves. Fig. 2, an orange leaf, showing the lower surface covered with the numerous 
pustules of Aschersonia tahitensis, growing parasitically on the larve of the mealy 
wing. Painted by Miss D. G. Passmore from material from Gainesville, Fla., February 
20, 1894. Both figures natural size. 
Plate VIII. Melanose on grape fruit.—Shows characteristic specks on leaves and 
twigs. Specimens from Citra, Fla. Photographed October, 1894, by W. T. Swingle 
and H. J. Webber. Two-thirds natural size. = 
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