ad 
ROSA. 
kept in a shady situation in the open 
air till wanted for forcing. Those 
that are wanted to blossom at 
Christmas, should be plunged into 
a hotbed, or put into a hothouse the 
lst of October ; those put into the 
hothouse in November will flower 
in January and February ; and so 
on, always calculating that the 
plants will flower about two months 
after they are placed in the hot- | 
house or frame. During the forcing 
they should be supplied abundantly 
with water of the same temperature 
as the house in which they are | 
kept. and the heat they are kept | 
in should never be less than 60° at | 
night. The China Rose may be 
made to flower all the winter by | 
keeping it in a greenhouse at 50°, | 
and having pinched off all its flow- 
er-buds in summer and autumn. 
The insects that attack Rose trees | 
are very numerous. Perhaps the 
most troublesome are the Aphides | 
(see Apnis), which cover the ten- 
der shoots in summer and autumn. | 
The caterpillars of several small | 
moths are also very destructive to | 
Rose trees. One of these, which | 
is called a leaf-miner, lives within | 
the leaf, where it feeds upon the 
pulpy matter, leaving traces of its | 
course by a number of pale yellow | 
zigzag lines, which are occasioned | 
by the skin of the leaf withering | 
when deprived of the pulpy matter 
which sepported it. The perfect 
insect is called: the Red-headed 
Moth (Microsétia - ruficapitélla) ; | 
- and it is so small, that even wah 
its wings expanded it does not 
measure more than a quarter of an 
inch. Another very destructive in- 
sect is the maggot or grub of one 
of the saw-flies. The perfect in- 
sect, which is a beautiful creature, 
with transparent wings, lays its eggs 
in the flower-bud; and in this the 
~ grub is hatched, eating its way out 
and destroying the petals that it 
passes through. Other mena: ig 
399 
ROSE ACACIA. 
a kind of leaf-rollers, not exactly 
like those that infest the oak, but a 
species of the genus Lyda (belong- 
ing to the Tenthredinide), which 
construct a portable case in which 
they enfold themselves, of pieces 
of leaves, which they cut out and 
fasten together in a spiral direction. 
Besides, there is the Rose Moth, a 
species of Tortrix, which fastens the 
bud, by a number of slender threads, 
to one of the leaves, which it doubles 
up like the folds of a fan. 
The only sure remedies for all 
these insects are hand-picking and 
frequent syringing. ‘Tobacco-wa- 
ter is also used; and this is made 
by pouring a gallon of boiling water 
on half a pound of the best shag 
tobacco, and letting the decoction 
remain till it is cold. ‘The infected 
' shoots should then be dipped in the 
tobacco-water, and suffered to re- 
| main in it about a minute, and then 
washed with clean water. If the 
tebacco-water be suffered to dry on 
the plants, it will blacken the young 
shoots; and the remedy will thus 
be worse than the disease. Lime- 
water is also sometimes used, but 
no more lime should be put in- 
to the water than to make it 
look slightly milky ; and the leaves 
should be washed after it has been 
suffered to remain on a short time. 
A strong decoction of quassia is 
another remedy ; and it is better 
than either lime or tobacco-water, 
as it does not injure the appearance 
of the plants. Dipping the shoots 
in clean water, and laying them on 
in one hand, while a soft brush is 
gently passed over them with the 
other, is also found very efficacious 
Rosco‘ra.—Scitaminee.—Hand- 
some stove-plants, somewhat resem- 
bling the Indian Shot. They should 
be grown in loam, peat, and sand* 
and they are increased by dividing 
the root. 
Rose.—See Ro'sa. 
Rose Acacia.—Robinia hispida 
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