The Book of Wheat: An Economic History and Practical Manual of the Wheat IndustryO. Judd Company, 1922 - 369 páginas |
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Página 151
... insects . One pound of seed has been known to multiply 99 - fold in one generation , and one seed 3,000 - fold . The ordinary observer cannot distinguish the young chess plant from wheat . Chess injures flour and must be cleaned from ...
... insects . One pound of seed has been known to multiply 99 - fold in one generation , and one seed 3,000 - fold . The ordinary observer cannot distinguish the young chess plant from wheat . Chess injures flour and must be cleaned from ...
Página 155
... insects and seeds more than counterbalances the damage occasioned by the eating of grain . At least 50 different birds act as weed destroyers and help to eradicate nearly 100 species of noxious plants . The number of weed seeds eaten is ...
... insects and seeds more than counterbalances the damage occasioned by the eating of grain . At least 50 different birds act as weed destroyers and help to eradicate nearly 100 species of noxious plants . The number of weed seeds eaten is ...
Página 167
... insect pest , and it may be greater than the loss from all other diseases combined . It is often not noticed because it is light . In one or another of the wheat growing sections , great areas are partially to nearly completely ...
... insect pest , and it may be greater than the loss from all other diseases combined . It is often not noticed because it is light . In one or another of the wheat growing sections , great areas are partially to nearly completely ...
Página 169
... Pass . ) and Powdery mildew ( Erysiphe graminis D. C. ) occasionally cause slight losses in certain sections . 1 Carleton , Cereal Rusts of U. S. , p . 21 . CHAPTER X. INSECT ENEMIES OF WHEAT Species . It has DISEASES OF WHEAT 169.
... Pass . ) and Powdery mildew ( Erysiphe graminis D. C. ) occasionally cause slight losses in certain sections . 1 Carleton , Cereal Rusts of U. S. , p . 21 . CHAPTER X. INSECT ENEMIES OF WHEAT Species . It has DISEASES OF WHEAT 169.
Página 170
... INSECT ENEMIES OF WHEAT Species . It has been estimated that there exist 1,000,000 species of insects of economic importance . About 100 species feed upon growing wheat , and about 50 more are found in granaries . Less than a dozen ...
... INSECT ENEMIES OF WHEAT Species . It has been estimated that there exist 1,000,000 species of insects of economic importance . About 100 species feed upon growing wheat , and about 50 more are found in granaries . Less than a dozen ...
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Términos y frases comunes
acre agriculture Amer American amount annual Argentina average baked bran bread bucket shop bushels bushels of wheat Canada cars cents per bushel century cereals Chicago chinch bug climate combined harvester commercial corn cost crop rotation cultivation durum wheat early elevators England Europe experiment station export factor farm farmers fertilizers field flour germination gluten grower grown harvest header Hessian fly Hybrid important increased industry insects irrigation Kansas kernel land larvæ loss macaroni machine machinery manure methods miller milling Minnesota moisture nitrogen North Dakota operation Pacific coast phosphoric acid plow potash pounds practically produced profitable railroads raised Red river valley Report Rept rotation Russia rust seed shipped smut soil sown speculative spores spring wheat storage straw supply threshing tion transportation United varieties weeds wheat crop wheat growing wheat plant winter wheat Yearbook U. S. Dept yield