. The natural history of the farm : a guide to the practical study of the sources of our living in wild nature . Natural history. 270 NATURAL HISTORY OP THE FARM. from within. These thus escape poisons deposited upon the surface of the plant, and are killed by spraying only when some contact in- secticide (like kero- sene emulsion, or various prepara- tions of nicotine, etc.) is thrown upon their bodies. Both types of feeders we often find side by side. We go Fig. 110. A colony of aphids on a leaf of Ceanothus; . , - ~ 1J t_ h, a syrphus-fly larva, feeding; i, a winged aphid; lntoacabbage-nelO
. The natural history of the farm : a guide to the practical study of the sources of our living in wild nature . Natural history. 270 NATURAL HISTORY OP THE FARM. from within. These thus escape poisons deposited upon the surface of the plant, and are killed by spraying only when some contact in- secticide (like kero- sene emulsion, or various prepara- tions of nicotine, etc.) is thrown upon their bodies. Both types of feeders we often find side by side. We go Fig. 110. A colony of aphids on a leaf of Ceanothus; . , - ~ 1J t_ h, a syrphus-fly larva, feeding; i, a winged aphid; lntoacabbage-nelO., j, an ant attending the colony; k, an aphid parasitized .. i â¢. (see fig. 113). where little white butterflies flutter above the rows, and we find their green larvae, "cabbage- worms," stretched at length upon the surfaces of the leaves, placidly eating out scallops in the margins. On loose cab- bage leaves we find whole colonies of minute gray-green aphids, "cabbage- lice", sucking the sap out of the leaves and making them buckle and curl. Most herbivorous insects are very limited in the range of their diet. They will feed upon the plants of but a few speciesâusually closely related species. The common potato-beetle eats other things besides potato, but only a few other species of the same genusâother solanums. This is, for the husbandman, a very fortu- nate limitation. The worst of our field and garden pests are species of insects from â Fl&cew?ng flyh(aftaerrVMa°ria«)e other lands. They have been brought. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Needham, James G. (James George), 1868-1956. New York : Comstock Pub. Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
