Southern field crops (exclusive of forage plants) . iny insects which WHEAT 63 find their way to a point witliin the leaf-sheath, wheretheir injuries cause many of the stems in spring to breakand faU over. The name flaxseed is applied to thepupal or transforming stage of the insect because of theresemblance of the pupa in color and shape to a flaxseed.This pest spends the summer on the wheat stubble.Hence the usual means of combating the insect is to burnthe stubble, or to plow it in thoroughly. Postponementof sowing until a severe frost occurs greatly decreases thenumber of eggs deposited in
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Southern field crops (exclusive of forage plants) . iny insects which WHEAT 63 find their way to a point witliin the leaf-sheath, wheretheir injuries cause many of the stems in spring to breakand faU over. The name flaxseed is applied to thepupal or transforming stage of the insect because of theresemblance of the pupa in color and shape to a flaxseed.This pest spends the summer on the wheat stubble.Hence the usual means of combating the insect is to burnthe stubble, or to plow it in thoroughly. Postponementof sowing until a severe frost occurs greatly decreases thenumber of eggs deposited in the fall. Rotation of cropsis an importantmeans of decreas-ing the injury. Chinch bugs. —Small insects thatundergo a nmnberof changes in sizeand color; aresometimes injuri-ous to wheat.When warfare ismade against them, it is usually afterthey have emergedfrom the wheatfleld and are invad-ing corn fields. The ivheat -plant-louse or green-bug (Fig. 9j. — This small gjeenish plant-louse has insome years proved very injurious to wheat in the south-. FxG. 22. — The AxgjU-Mois Cjkaix-moth.Enlarged 6 times. CSV. E. Hind.s.) 64 SOUTHERN FIELD CROPS western part of the wheat-growing region. Its injury isdone by sucking the juices from the plant. Its naturalenemies among insects are relied on to keep the green-bugin subjection. One of these, a lady-bug beetle (Fig. 10), has sometimes been propagated by entomologists and sentinto the infested regions. In the shock, stack, or bin the wheat grain is attackedby weevils and by the larva, or worm stage, of the small, gray grain-moth {Galechia cerealella) (Fig. 22). The reme-dies consist in prompt threshing of the grain and in placingnear the top of the tight bin of threshed gTain one poundof carbon-disulfide for each 30 bushels of grain. Thisliquid promptly vaporizes. The vapors are destructiveto insect hfe. They are also quite inflammable, so that nofire, or light, or smoking is permissible about the granarywhile grain is being thus fumiga