Annual report of the Agricultural Experiment Station of the University of Minnesota . ing to go to the trouble of spreading straw from threshingover the stubble, thus insuring the burning and at the same timegetting rid of some flax seeds which may have lodged on thesurface of the straw pile at the time of threshing. 2. Fall plowing of the stubble in such a way that the straw iscompletely turned under. 3. All screenings and litter about the threshing machine shouldbe cleaned up and either fed immediately or burned, leaving no INSECTS INJURIOUS IN 1902. 5 litter from the threshing on the field.
Annual report of the Agricultural Experiment Station of the University of Minnesota . ing to go to the trouble of spreading straw from threshingover the stubble, thus insuring the burning and at the same timegetting rid of some flax seeds which may have lodged on thesurface of the straw pile at the time of threshing. 2. Fall plowing of the stubble in such a way that the straw iscompletely turned under. 3. All screenings and litter about the threshing machine shouldbe cleaned up and either fed immediately or burned, leaving no INSECTS INJURIOUS IN 1902. 5 litter from the threshing on the field. There is no absolute needof burning the straw pile. The flies emerging from flax seedsin the center of the pile will never reach the surface. 4. Since the fly lays its eggs as a rule near the locality whereit emerges from the flax seed it is best not to plant wheat onthe same ground two years in succession where rotation is possi-ble. Varieties of wheat that produce a stout stalk are the leastaffected by this pest. 5. Co-operation is absolutely necessary, for, however careful one. Fig. 3.—Cecidomyia destructor (Hessian fly) : (a) male; (b) enlarged analment; (c) bead of female: (d) bead of male; (e) scale fromleg of male ; (f) scale from wing; all greatly en-larged. C. L. Marlatt, U. S. Dept. of of Entomology. man may be, if his neighbor is not equally so the latters fieldswill afford a supply of this pest for the former. Since this pestissues from the flax seed early in May, a stubble field left forcorn land and not plowed up to the 10th of May or later has prob-ably discharged its quota of flies ready for mischief before plow-ing. INSECTS INJURIOUS IN 1902. APPEARANCE AND LIFE HISTORY OF THE HESSIAN FLY. The fly is dark colored, much smaller than an average sizedmosquito which it somewhat resembles. Each female lays on anaverage over 200 eggs (generally early in May in this latitude)on the upper surface, usually, of the leaves of the wheat. It isknown to also infe
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectagriculture, bookyear
