. Relazione annuale del Missouri State Board dell'agricoltura. Missouri. Scheda Stato dell'agricoltura; Agricoltura -- Missouri. Insetti dannosi per il mais. 28j io"^??^. W^^>", sasife^^-^'^ Cutworm, Feltia iaria. Falena adulta; ampliato. una malattia batterica, che sembra che il loro attacco e ucciderli fuori molto ,/rapidamente, soprattutto quando le larve divenire eccessivamente abbondanti. Essi sono anche, come la maggior parte cutworms, soggetto agli attacchi di insetti parassiti e degli uccelli. Questi clay-backed cutworms preferiscono il trifoglio in preferenza di bluegrass, e attaccare i campi di grano più specialmente quando il mais segue il chiodo di garofano

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. Annual report of the Missouri State Board of Agriculture. Missouri. State Board of Agriculture; Agriculture -- Missouri. INSECTS INJURIOUS TO CORN. 28j i«^??^. W^^>', sasife^^-, ^'^ Cutworm, Feltia iaria. Adult Moth; enlarged. a bacterial disease, which seems to attack them and kill them off very , /rapidly, especially when the larvae become unduly abundant. They are also, like most cutworms, subject to the attacks of parasitic insects and of birds. These clay-backed cutworms prefer clover in preference to bluegrass, and attack the corn fields more especially when the corn follows the clover field pre- viously turned under; or where the insects are infesting neigh- boring clover fields in undue numbers, they frequently leave these fields in great abundance, Jju ''?~'^''^ ciay-Backed sometimes in a body similar to the army-worm, and are then likely to spread to the corn field and devour it, like unto the well-known army- worm attack, eating the leaves of the corn plant instead of cutting the plant down, as is the case with most cutworms. Their work in the corn fields always consists of eating the leaves and the stems above ground. The larvae are most abundant from the middle of April through May. After May they enter the earth, so that by the middle of June practically all of them have disappeared. They remain in the ground in a dormant condition for upwards of six weeks before they transform to the pupae stage, the moths appearing during September, and soon depositing their eggs. Figure 38 represents a moth enlarged. The best method of protecting a corn field from the attack of these worms is to plow a furrow alorg the side nearest the clover field, with vertical side toward the corn, and then dig post holes every five or six feet in this furrow. When the larvae leave the clover field for the corn, not being able to cross the vertical furrow, they will crawl along and fall into the post holes. One can also kill great numbers by scattering poisoned clover or bran

Parole chiave associate all'immagine

• bookcentury1800
• bookcollectionbiodiversity
• bookdecade1890
• libro