This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1912 Excerpt: ... from Florida. The white fly is not harmed by
nicotine fumigation, but succumbs to hydrocyanic acid gas. However,
owing to the dangerous nature of the last named remedy, it was
thought inadvisable to make use of this method of extermination.
Owing to the active movements of this pest when in the adult stage,
it is rather difficult to exterminate it by means of spraying,
since it is necessary for the spray actually to hit the insect; but
by spraying two or three times at intervals of a day or two, the
pest may, for the most part, be overcome. Other sucking insects
that are almost invariably present in plant houses (and the
conservatories of the Brooklyn Botanic Garden are not exceptional
in this respect) are the mealy bug(DactyIopius destructor), several
species of scale insects belonging to the Coccidae, and the red
spider (Tetranychus telarius). Mealy bug and scale insects can be
destroyed by constant spraying with a contact spray of some kind,
the most effective preparation being kerosene emulsion. The
spraying, however, has to be repeated often, and the more
efficacious method is, where the nature of the plants permit, to
wash off the insects with a sponge and soapy water. Red spider
flourishes in a dry atmosphere, and the best methods of control are
the maintenance of humidity and spraying with clear water, which
must be applied to the underside of the leaves, where the red
spider has his habitation, with a sufficient force to break the
webs. Potassium sulphide, at the rate of one or two ounces to three
gallons of water, applied in the same way, is also helpful, but has
the disadvantage of discoloring any paint with which it comes in
contact. A sucking insect, which amongst horticulturists goes by
the name of the white tailed mealy bug, lantane bug, and...
|Country of origin:
Brooklyn Botanic Garden
||246 x 189 x 5mm (L x W x T)
||Paperback - Trade
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