. Insetti dannosi per la frutta. Illustrato con quattro cento e quaranta legno-tagli. Pesti di insetto. 286 insetti dannosi per le cellule di uva è mostrato con la fly in appoggio su di esso; anche uno di th^ chrysalids. Di tanto in tanto questo insetto è molto distruttivo, talvolta en- tirely scomposizione della vigna. In tali casi il fogliame devono essere irrorate con l'elleboro e acqua o Paris-verde e l'acqua, nelle proporzioni indicate al n. 140. No. 157.-l'uva-foglia di vite-tramoggia. Erythroneura vitis (Harris). La figura allegata, 297 rappresenta l'insetto com- monly noto tra i viticoltori come " Thri

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. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 286 INSECTS INJURIOUS TO THE GRAPE cells is shown with the fly resting on it; also one of th^ chrysalids. Occasionally this insect is very destructive, sometimes en- tirely stripping the vines. In such cases the foliage should be sprinkled with hellebore and water, or Paris-green and water, in the proportions given under No. 140. No. 157.—The Grape-vine Leaf-hopper. Erythroneura vitis (Harris). The accompanying figure, 297, represents the insect com- monly known among vine-growers as the " Thrip.^^ The insects are shown Fig. 297. magniiied; the shorter lines adjoin- ing indicate their natural size. The figure to the left shows the mature in- sect wath its wings expanded, the other the same with its wings closed. It is rather more than one- eighth of an inch long, crossed by two broad, blood-red bands, and a third dusky one at the apex, the anterior band occu- pying the base of the thorax and the base of the wing-covers, the middle one wide above, narrowing towards the margin. Besides vitis, there are half a dozen or more which are sup- posed to be distinct species, all about the same size, and w^ith the same habits, differing only in the markings on the wings. These insects pass the winter in the perfect state, hiber- nating under dead leaves or other rubbish, the survivors be- coming active in spring, when they deposit their eggs on the young leaves of the vine. The larvae are hatched during the month of June, and resemble the perfect insect except in size and in being destitute of wings. During their growth they shed their skins, which are nearly white, several times, and, although exceedingly delicate and gossamer-like, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Saunders, William, 1

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• bookpublisherphila
• bookyear1883