The plants were entirely uninjured by the application.
Thoroughly sprayed some rose bushes badly infested with aphides, and
carried off some of the worst branches. On these the lice were dead
next morning; but on the bushes the effect was not so satisfactory,
most of the winged forms and many mature wingless specimens were
unaffected, while the terminal shoots and very young leaves were
drooping as though frosted. All, however, recovered later.
The same experiment repeated on other, hardier roses, resulted
similarly so far as the effect on the aphides was concerned, but there
was no injury to the plant.
Used this same mixture on the caterpillars of _Orgyia leucostigma_
with unsatisfactory effect, and with the same results used it on a
number of other larvae. Used on the rose leaf roller, _Cacaecia
rosaceana_, it was promptly effective.
Tested for injury to plants, it injured the foliage and flowers of
wisteria, the younger leaves of maple and grape, and the finer kinds
of roses.
From these few experiments kainit seems preferable to the muriate, as
acting more effectively on insects and not injuriously on plants. For
general use on plants it is not to be recommended.
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