. Saggio sulla mosca di Hesse, frumento midge e altri insetti dannosi per le colture di frumento [microformati]. Il frumento; insetti; Blé; Insectes. 18 PRIZB saggio: colore giallo, una sola-tunth di un pollice lungo, bisognosi di gamba^, e l'ONU&ble di •pin a filo. ≫ questi bruchi distruttivo può essere neparated dal grano da trebbiare- ing e Y/innowing; la pula che li contengono devono essere messi in grandi vasche e acqua bollente versata su di esso sufficiente per uccidere tutti gli insetti. Tinea granella, o com moth.-Questo insetto attacchi talvolta grano nel covone, ma principalmente infests granai, alimentazione su tutti i

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. Essay on the Hessian fly, wheat midge, and other insects injurious to the wheat crops [microform]. Wheat; Insects; Blé; Insectes. 18 PRIZB essay: yellow colour, only one-tunth of an inch long, destitute of leg^, and un&ble to •pin a thread. > These destructive caterpillars may be neparated from the wheat by thresh- ing and Y/innowing; the chaff containing them should be put into large tubs and boiling water poured upon it sufficient to kill all the insects. Tinea Granella, or com moth.—This insect sometimes attacks grain in the sheaf, but principally infests granaries, feeding on all sorts of grain, but most partial to wheat. The perfect moth does not exceed half an inch in length; its wings when laid over each other slope at the sides. The upper wings are whitish coloured, with dark brown and dusky spots; its body is brown variegated with white, and its head has a thick tun of yellowish-white hairs. Thirty eggs or upwards are laid by each female ; they are so minute as to be scarcely observable to the naked eye; one or two are attached Jo each grain of wheat. The larva is speedily hatched, and immediately bores its way into the grain, closes up the opening by which it entered, and remains in the interior till it eats up every thing but the husk; this process it keeps on re- peating in different grains till it is full grown; it glues together all the grains which it has used, and tracks all the path over which it passes wi^ a silken and somewhat excrementitious web; when full grown it leaves the chain of emptied grains on which it has fed, and runs across all the neighbouring grain, covering it with greyish-white webs. The full grown caterpillar is about half an inch long and has 16 feet, its bocly is yellowish-white, its head brownish-red, and its neck marked with two transverse brown stripes. When running across the grain they are in search of a retreat in which to undergo their transformation, they get into cracks in the floor and around the corn bi

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade
• booksubjectinsects
• booksubjectwheat