ceria brie I Se ORT 
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its body is dusted over with a kind of white 
powder; its hind legs are long and fringed; and 
its eggs are black and shining.—The pine-branch 
plant-louse, Aphis pinz, found on the young shoots 
of the Scotch pine, and forming a kind of galls 
like small pine cones, has a grayish-brown colour 
mingled with red; its body is one-sixth of an 
inch in length; its rump-horns are short and 
teat-like; its belly is yellowish-brown; and its 
eges are glossy black and oblong—tThe oak-leaf 
plant-louse, Aphis roboris, has a prevailingly 
black colour; its ears are livid and tipped with 
black ; its thighs are rusty-red; its body is 
large and somewhat globular; and its abdomen 
has very short horns on the middle——The dock 
plant-louse, Aphis rumicis, is prevailingly black ; 
its ears and shanks are pale ; its body is opaque ; 
its abdomen is raised and plaited; and its tail is 
furnished with a short bristle—The linden plant- 
louse, Aphis tiliw, has a prevailingly greenish- 
yellow colour with black dots; its ears and legs 
are variegated with white and black ; its corselet 
has a black lateral line on each side; its abdo- 
men is blunt, with four lines of black dots; and 
its eggs are black and covered with a white 
down.—The elm plant-louse, Aphis ulmi, has a 
prevailingly rusty-black colour ; its body is cov- 
ered with longish white down; its ears are very 
large ; its wings are transparent and very long, 
and have a small brown spot at the outer edge ; 
and its rump-horns are indistinct. The ten spe- 
cies now enumerated are those whose ears are not 
tapering, but rather thread-shaped. 
The bean plant-louse, bean-dolphin, or collier, 
Aphis fabe, has a deep black colour, and has be- 
come familiar to the most common observer from 
its swarming on the tops of bean-plants about 
the time of their beginning to pod. It infests 
the tops of all varieties of beans, spinage, and 
several other plants, and is very destructive to 
crops. Whenever it appears, the tops of all the 
plants in a bed, division, or field ought to be cut 
off into a receiving vessel with a sharp knife or a 
pair of scissors; and if it reappears, another sec- 
tion of the tops of all the plants ought to be cut 
off—The hop plant-louse, Aphis humuli, has a 
prevailingly green colour; its ears and rump- 
horns are tipped with black; and it closely re- 
sembles the rose plant-louse, but is smaller. It 
is found—not, as is usually asserted, on previously 
diseased plants,—but on the youngest and health- 
iest leaves and shoots of the hop. In many years, 
it inflicts great and extensive injury upon the 
hop crop; in some years, as in 1793 and 1798, it 
caused the entire crop to fail; and, in spite of the 
hop grounds being confined to portions of only 
two or three counties, it has occasioned to the 
hop-growers of England the loss of very many thou- 
sands, we might perhaps say millions, of pounds 
sterling. Syringing with soap-suds and tobacco 
water is a partial remedy ; topping, as in the case 
of the bean plant-louse, would be quite effectual, 
but would damage the plants; and a really good 
APHIS. 
and thorough remedy has yet to be invented.— 
The carrot plant-louse, Aphis dauci, has a pre- 
vailingly dark yet diversified colour ; its ears are 
black, but pale at the base; its head and corselet 
are brown; its abdomen is green, with a black 
blotch at the tail; and its legs are black. It oc- 
curs on the umbels of carrot plants, and prevents 
or damages the formation and ripening of the 
seed. As soon as it is observed, it ought to be 
assailed with soap suds and tobacco water —The 
gooseberry plant-louse, Aphis grossularie, is of 
a light green colour when young, and of a dark 
green colour when old. It appears on the twigs | 
and leaves of the gooseberry plant in April, and is | 
sometimes very destructive of the fruit. The com- 
mon people in the middle districts of Yorkshire 
imagine the swarms of it to be occasioned by the 
smoke of Leeds. 
leaves.—The cherry plant-louse, Aphis cerasi, has 
prevailingly a glossy black colour ; its shanks and 
the middle of its ears are pale; its corselet is red- 
dish brown above, and quite red beneath; its fore- 
feet are pale; its other feet are black, with white | 
spots; and its body is stout, plump, and egg- 
shaped. It infests the leaves of the cherry-tree, 
and generally inflicts great damage. It com- 
mences its devastations about the end of April or 
beginning of May; it rapidly multiplies from that | 
time till June; and it then leaves the trees and | 
does not reappear till September. All trees at- 
tacked by it ought to be syringed with soap-suds 
and tobacco water.—The lettuce-root plant-louse, 
Aphis radict lactuce, has a greenish-white colour, 
and is comparatively large and plump. It occurs 
under ground about the crown of the roots of 
lettuce and endive; and is most abundant in au- 
tumn. A community of ants usually environ the 
roots attacked by it, in order to feed on its honey 
dew; and they contribute even more powerfully 
than itself either to ruin the plants or at least to 
prevent them from seeding. See article Ant. 
Soap-suds ought to be copiously poured, and the 
soil firmly trodden in, around the roots of all in- 
fected lettuces and endives—The currant-root 
plant-louse, Aphis radicis ribis, is comparatively 
small in size, has a buff or flesh colour, and is 
covered with a sort of cottony down. It attacks 
the roots of currant leaves, and causes the leaves 
to fall, from the middle of July till the end of 
September; and it then becomes winged and 
migrates. It is best combated by soap-suds and 
the treading in of the soil—The vine plant-louse, 
Aphis vitis, has a prevailingly greenish colour; 
its abdomen is brown on the back; and it has a 
brown dot between the ears. It works great 
havoc upon the vines of vinous countries, but 
probably has not found its way into Great Bri- 
tain.—The zebra or elder-tree plant-louse, Aphis 
sambuct, is comparatively large in size, and has 
a prevailingly black colour, with three white 
streaks on each of its sides; and the base of its 
It may be partially destroyed | 
by soap-suds and tobacco water; but is more | 
effectually combated by picking off the infected | 
