Insects Injurious to VegetablesO. Judd Company, 1907 - 262 páginas |
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Página viii
... cultivating - Clean farm- ing methods - Farm inspection - Cooperation in the control of insects . CHAPTER III MECHANICAL METHODS OF DESTROYING INSECTS OR PREVENT- ING INJURY CHAPTER IV INSECTICIDES AND THEIR USES Stomach poisons ...
... cultivating - Clean farm- ing methods - Farm inspection - Cooperation in the control of insects . CHAPTER III MECHANICAL METHODS OF DESTROYING INSECTS OR PREVENT- ING INJURY CHAPTER IV INSECTICIDES AND THEIR USES Stomach poisons ...
Página 2
... enemies . A knowledge of the weeds and wild plants that furnish food for these insects , in addition to cultivated plants , and the soils in which they attain their greatest development is also desirable .. 2 INSECTS INJURIOUS TO ...
... enemies . A knowledge of the weeds and wild plants that furnish food for these insects , in addition to cultivated plants , and the soils in which they attain their greatest development is also desirable .. 2 INSECTS INJURIOUS TO ...
Página 4
... cultivation . It is first desirable to eliminate animals which are not true insects but are related to them . These are all included ( with Fig . 5. - Water - cress sowbug ( Man- casellus brachyurus ) . Enlarged . ( After Richardson ...
... cultivation . It is first desirable to eliminate animals which are not true insects but are related to them . These are all included ( with Fig . 5. - Water - cress sowbug ( Man- casellus brachyurus ) . Enlarged . ( After Richardson ...
Página 20
... cultivating a single crop can be pointed out . In some years in the past it was simply impossible for truckers in parts of Maryland and Virginia to make a living from cabbage , or other cruciferous crops or from melons and other ...
... cultivating a single crop can be pointed out . In some years in the past it was simply impossible for truckers in parts of Maryland and Virginia to make a living from cabbage , or other cruciferous crops or from melons and other ...
Página 21
... cultivation . The numbers of the squash - vine borer can be greatly reduced by lightly harrowing the surface of infested fields after harvest so as to bring the cocoons to the surface , and then plowing in the spring to a uniform depth ...
... cultivation . The numbers of the squash - vine borer can be greatly reduced by lightly harrowing the surface of infested fields after harvest so as to bring the cocoons to the surface , and then plowing in the spring to a uniform depth ...
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Términos y frases comunes
abundant adult affected aphides appearance applied arsenicals asparagus attack Author's illustration bean weevil beans beet bill-bug bisulphid blister beetles Bordeaux mixture borer cabbage worm carrot caterpillars celery color Colorado potato beetle corn crops cucumber beetle cucurbits cultivation cutworms damage deposited destroy destructive eggs enlarged fall plowing farm farmers feed female fields flea-beetles fore-wings forms frequently fruit garden grasses grasshoppers ground grower grown habits hatch hibernation inch infested insect enemies insecticides insects INSECTS INJURIOUS kerosene kerosene emulsion killed larva larvæ leaf-beetles leafhoppers leaves less looper maggot melon aphis methods natural nearly numbers onion Paris green pea weevil pests plant-bug poisons potato beetle practical pupa remedies Riley root-worm roots season seed shown in figure soap soil sometimes species spray squash stage stalk stalk-borer striped surface sweet potato thrips tion tobacco tomato tortoise beetle tubers U. S. Dept vegetables webworm weeds white grubs wing expanse wireworms young plants
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