. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. 176 FARM FRIENDS AND FARM FOES tory of one of these in brief is this: The adult fly de- posits its egg within the body of a caterpillar, especially the caterpillars of the large silkworm moths, like the polyphe- mus moth or the cecropia moth. This egg shortly hatches into a small white footless maggot that absorbs the body juices of the host, as the victim is often called, but at first does not seriously interfere with its development. The caterpillar with its enemy inside
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. 176 FARM FRIENDS AND FARM FOES tory of one of these in brief is this: The adult fly de- posits its egg within the body of a caterpillar, especially the caterpillars of the large silkworm moths, like the polyphe- mus moth or the cecropia moth. This egg shortly hatches into a small white footless maggot that absorbs the body juices of the host, as the victim is often called, but at first does not seriously interfere with its development. The caterpillar with its enemy inside continues to feed and grow for some time. It is commonly able to spin its cocoon and perhaps change to a pupa within the cocoon before the larva of the parasite becomes so large as to kill the host. It does kill it, however, finally, and then within the protect- ing shelter of the host's cocoon, the larva of the Ophion Fly changes to a chrysalis. The fol- lowing spring itwillchangeagain to an adult fly, like the one that laid the egg in the caterpillar so many months before. This fly is provided with sharp jaws by means of which it gnaws its way out of the cocoon and flies freely about. It has thus completed the cycle of a parasite's life. Sometimes the egg of the par- asite is not laid within the cater- pillar until after it has spun its cocoon. This is often the case with certain medium-sized Ich- neumon Flies of the genus Pimpla. These may sometimes be seen standing upon the cocoons of the common apple-tree tent caterpillar, with the ovipositor thrust down through the cocoon in the-manner. Ichneumon Fly and Butter- fly Chrysalis in which it developed. 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 Weed, Clarence Moores, 1864-1947. Boston ; New York : D. C. Heath & Co.
Size: 1233px × 2027px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1910
