. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . evention and Eemedies.—Witches Brooms should becut oft and burnt, and in cases where the tree is muchinfested with the small gradually-forming tufts of diseasedgrowth it is desirable to cut it down and burn the mite-infested twigs. The Gall Mites have no power of flying, butthe wind wafts them about on leaves or broken twigs, or birdscarry them in their plumage, and when once well establishedthe attack spreads
. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . evention and Eemedies.—Witches Brooms should becut oft and burnt, and in cases where the tree is muchinfested with the small gradually-forming tufts of diseasedgrowth it is desirable to cut it down and burn the mite-infested twigs. The Gall Mites have no power of flying, butthe wind wafts them about on leaves or broken twigs, or birdscarry them in their plumage, and when once well establishedthe attack spreads regularly onwards slowly but steadily tothe neighbouring Birches. During the last few years Gall Mite attack to the leaf andflower buds of Black Currants has increased to a veryserious extent, so as to cause great loss to is referred to under its own heading, but as (from theirexcessive minuteness) there is great difficulty in ascertainingwhether there is specific difference in Phytopti infestingdifferent kinds of plants, the above notes may be of some useas to the general character of the infestation. 216 ELM. Beetle. Scolytus destructor, Beetle magnified; nat. length, lA to 3 lines; workings in Elm-bark, showingcentral mother-gallery, and maggot-galleries from it. This beetle is well known as causing much injury to Elmtrees by means of the galleries that it bores between the barkand the wood, mainly in the soft inner bark, but so as alsoto leave just a slight trace of the working on the surface of thewood. The females may be seen early in June, making theirpreparations for egg-laying by working their way along thebottom of cracks in the bark, which they widen for somedistance before beginning to burrow, so that the real openingof the galleries may be at some distance from the heap ofrejected matter or little heap of wood-dust that marks thefirst point of entrance. The male is present for only a short time after the burrowis begun, befo
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Keywords: ., bookcentury1800, bookdecade1890, bookidmanualofinju, bookyear1890
