. Insetti pregiudizievole della fattoria e giardino. Con un capitolo sugli insetti utili. Gli insetti. Del FAEM GAEDEK E. 259 L'uva foglia-tramoggia (Tettigonia vitis, Harris.) In molte parti del paese se uno passa attraverso una vigna durante il mese di luglio o agosto, sarà lui a essere infastiditi dalle nuvole di un piccolo insetto Avhich, come ilies, appare come se si trattasse di un bianco sporco colore. Questi insetti sono generalmente noti come "Thrips", un nome appartenente ad un altro genere e che dovrebbe essere sostituito da foglia-tramoggia. L'insetto appartiene all ordine Hemiptera, o vero bug. Essa è la Tettigonia vitis

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. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. OF THE FAEM AND GAEDEK. 259 THE GRAPE LEAF-HOPPER, (Tettigonia vitis, Harris.) In many parts of the country, if one passes through a vineyard during July or August, he will be annoyed by the clouds of a small insect Avhich, as it ilies, appears as if it were of a dirty white color. These insects are generally known as "Thrips, " a name belonging to a different genus, and which should be superseded by Leaf-hopper. The insect belongs to the Order Hemiptera, or true Bugs. It is the Tettigonia vitis of Harris (though some authors place it in Erythroneurd), who thus describes it: " In its perfect state it measures one-tenth of inch in length. It is of a pale-yellow color; there are two little red lines on the head. The back part of the thorax, the scutel, the base of the wing-covers, and a broad band across their middle are scarlet; the tips of the wing-covers Fig. 156.—GRAPE are blackish, and there are some little LEAT-HoppEii. j.g^ li^eg between the broad band and the tips. The head is crescent-shaped above, and the eyelets are situated just below the ridge of the front." The insects appear upon the underside of the leaves in June, but are not much noticed, as they do not have their wings until later. They pass their larvae state quietly, sucking at the juices of the leaves, which they penetrate with their beaks, though if disturbed at this time, they leap from leaf to leaf in a lively manner. They undergo all their changes on the leaves, and their empty skins may be found on the underside of the leaves, or upon the ground beneath the vine, in great numbers. The insect probably hibernates in the perfect state, hid- den in the rubbish and fn tiifts of grass. When present in great numbers, they rob the vine of its proper nutri-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• booksubjectinsects
• bookyear1887