. Biology and human life. Biology. Fig. 240. The calosoma beetle (Calosoma sycophanta). (Somewhat reduced) This beautiful green animal was used by a French scientist in a campaign against the gypsy moth in 1840. In recent years this method of fighting undesirable insects by encouraging the spread of an enemy insect has been rapidly extended, especially in the United States, which leads the world in applied entomology, a, adult: b, larva feeding on pupa of gypsy moth; c, adult feeding on larva (caterpillar) of gypsy moth The other natural enemies of insects are toads, frogs, snakes, and, most i
. Biology and human life. Biology. Fig. 240. The calosoma beetle (Calosoma sycophanta). (Somewhat reduced) This beautiful green animal was used by a French scientist in a campaign against the gypsy moth in 1840. In recent years this method of fighting undesirable insects by encouraging the spread of an enemy insect has been rapidly extended, especially in the United States, which leads the world in applied entomology, a, adult: b, larva feeding on pupa of gypsy moth; c, adult feeding on larva (caterpillar) of gypsy moth The other natural enemies of insects are toads, frogs, snakes, and, most important of all, nearly all kinds of birds. A given amount of money spent in protecting and encouraging the native birds of a region is likely to produce more beneficial results than any other method of fighting insects. 409. The balance of nature. The number of individuals in a species changes from year to year, partly on account of cli- matic conditions, as when an early frost destroys plants before the seeds are ripened, or when the frost kills off certain enemies. But much of the fluctuation is due directly to the variation in other species. A good year for ladybirds will mean a poor year. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
