Insects Injurious to VegetablesO. Judd Company, 1907 - 262 páginas |
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Página vi
... number of such publications on American economic ento- mology , the Bureau of Entomology , United States Department of Agriculture , has cited no less than 12,645 titles that had appeared to January 1 , 1905 , and the number of ...
... number of such publications on American economic ento- mology , the Bureau of Entomology , United States Department of Agriculture , has cited no less than 12,645 titles that had appeared to January 1 , 1905 , and the number of ...
Página 2
... number of generations produced each year ; the first appearance of the insect and its disappearance , and the same of each generation ; its food plants , natural and culti- vated , and above all , its favorite foods , both as larva and ...
... number of generations produced each year ; the first appearance of the insect and its disappearance , and the same of each generation ; its food plants , natural and culti- vated , and above all , its favorite foods , both as larva and ...
Página 13
... numbers of scale insects . Ladybirds also devour the eggs and larvæ of various other insects , and especially of ... number the great Lebia * follows the Colorado beetle wherever it goes , and appears to α Fig . 20. - Syrphus - fly ...
... numbers of scale insects . Ladybirds also devour the eggs and larvæ of various other insects , and especially of ... number the great Lebia * follows the Colorado beetle wherever it goes , and appears to α Fig . 20. - Syrphus - fly ...
Página 14
... numbers until their injurious hosts have done more or less damage . Their principal useful- ness , then , is in so decimitating the numbers of noxious species in one season that few are left to prey upon crops the following year . The ...
... numbers until their injurious hosts have done more or less damage . Their principal useful- ness , then , is in so decimitating the numbers of noxious species in one season that few are left to prey upon crops the following year . The ...
Página 18
... number of plants , we can not now procure all of the most favor- able conditions . As an instance , we have only to cite the re- ported successful use of kainit and nitrate of soda as a remedy for wireworms and some other insects in New ...
... number of plants , we can not now procure all of the most favor- able conditions . As an instance , we have only to cite the re- ported successful use of kainit and nitrate of soda as a remedy for wireworms and some other insects in New ...
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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 mature 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 species spray squash stage stalk stalk-borer striped surface sweet potato thrips tion tobacco tomato tortoise beetles tubers U. S. Dept vegetables webworm weeds white grubs wing expanse wireworms young plants
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