. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 196 PESTS OF GARLEX AXI) FIELD CHOPS. Fig. 244. — The Beet Leafhopper, Enlarged and natural size. Original. abling it to jump quickly and take wing readily. The younger stages are similar, but are smaller and wingless. Usually the hoppers appear in the beet field suddenly, having fed first on some other plant, probably species of weeds. In hot. dry fields conditions are especially favorable to the pest and unfavorable to the beets, while in fields where the reverse concUtions prevail the beets are able to wit
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 196 PESTS OF GARLEX AXI) FIELD CHOPS. Fig. 244. — The Beet Leafhopper, Enlarged and natural size. Original. abling it to jump quickly and take wing readily. The younger stages are similar, but are smaller and wingless. Usually the hoppers appear in the beet field suddenly, having fed first on some other plant, probably species of weeds. In hot. dry fields conditions are especially favorable to the pest and unfavorable to the beets, while in fields where the reverse concUtions prevail the beets are able to withstand attack. Infested fields may be sprayed with a contact insecticide, making the first application just as the young n^Tuphs are found in numbers, and repeating. Kerosene emulsion may be used, diluting the stock solution with S parts of water. It is ver\" difficult, however, to hit all the insects with the spray. A drag may be used to turn the leaves over, so as to help to make the application more thorough. Frames coated with tar dragged through the fields at the first appear- ance of the adults will catch many, and will help to check injury. The Spring Grain-aphis, or " Green Bug" {ToxopUra graminum Rond.) Occasionally, in recent years, oats, wheat, barley, and sometimes com have been damaged to the extent of millions of dollars by this tiny louse. It occurs in both winged and wingless forms. The latter is about one twentieth of an inch long, j'eUowish green, with a faint dark line down the middle of its back. Its eyes are quite black. The winged form is a little larger, has a dark thorax, but otherwise is of the same general appearance. Attack comes on suddenly in the spring. Countless billions of the lice appear on young grain, sucking the juice of the leaves, stunting the growing plants or killing them outright. Reproduction goes on rapidly. When the fields in a section attacked are destroyed, or the plants have. Please note that these images are extra
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
