Insects Injurious to VegetablesO. Judd Company, 1907 - 262 páginas |
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Página 7
... looper ( Autographa brassica ) . a , Male moth ; b , egg : G caterpillar ; d , pupa in cocoon . a , c , d , One - third larger than natural ; b , more enlarged . ( a , c , d , after Howard ; b , Chittenden , U. S. Dept. Agr . ) pillars ...
... looper ( Autographa brassica ) . a , Male moth ; b , egg : G caterpillar ; d , pupa in cocoon . a , c , d , One - third larger than natural ; b , more enlarged . ( a , c , d , after Howard ; b , Chittenden , U. S. Dept. Agr . ) pillars ...
Página 24
... looper , that cannot be held in subjection by ordinary poisons . If growers who suffer most could induce neighboring farmers to employ clean farming methods and crop rotation , the ravages of these pests would be greatly reduced . The ...
... looper , that cannot be held in subjection by ordinary poisons . If growers who suffer most could induce neighboring farmers to employ clean farming methods and crop rotation , the ravages of these pests would be greatly reduced . The ...
Página 140
... Looper ( Autographa brassica Riley ) . -Late cabbage particularly southward is much subject to injury by the looper or cabbage " plusia " which is , next to the imported cabbage worm and the harlequin bug , our most important. 140 ...
... Looper ( Autographa brassica Riley ) . -Late cabbage particularly southward is much subject to injury by the looper or cabbage " plusia " which is , next to the imported cabbage worm and the harlequin bug , our most important. 140 ...
Página 141
... looper " is at first a pale - green , fragile - looking creature , and varies in color when mature , being strongly marked with white lines , shown in figure 9 , c . It constructs for pupation a white , gauzy cocoon , d , which is ...
... looper " is at first a pale - green , fragile - looking creature , and varies in color when mature , being strongly marked with white lines , shown in figure 9 , c . It constructs for pupation a white , gauzy cocoon , d , which is ...
Página 142
... looper parasit.zed by Copidosoma runcatella Slightly enlarged ( After Riley , U. S. Dept. Agr . ) care is necessary in its preparation ; but when crops are grown on a large scale it might pay to use this remedy . It has the advantage of ...
... looper parasit.zed by Copidosoma runcatella Slightly enlarged ( After Riley , U. S. Dept. Agr . ) care is necessary in its preparation ; but when crops are grown on a large scale it might pay to use this remedy . It has the advantage of ...
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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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