. Bulletin. Natural history; Natural history. Fig. 1. Adult Hessian Fly, male. (U. S. D. A. Bureau of Entomology.) Fig. 2. Adult Hessian Fly, female. ( V. .S. D. A. Bureau of Entomology.) The little orange-red maggots which hatch from the eggs work their way downward until they reach a point where the leaf-sheath is joined to the main stem of the wheat plant. Their descent may be assisted by a drop of dew or rain. Having reached this point, they become permanently established and feed by sucking out the sap. A shoot that is attacked by several of them is weakened and finally killed. Under favo
. Bulletin. Natural history; Natural history. Fig. 1. Adult Hessian Fly, male. (U. S. D. A. Bureau of Entomology.) Fig. 2. Adult Hessian Fly, female. ( V. .S. D. A. Bureau of Entomology.) The little orange-red maggots which hatch from the eggs work their way downward until they reach a point where the leaf-sheath is joined to the main stem of the wheat plant. Their descent may be assisted by a drop of dew or rain. Having reached this point, they become permanently established and feed by sucking out the sap. A shoot that is attacked by several of them is weakened and finally killed. Under favorable weather conditions, the maggots grow very rapidly and become full-grown in about two weeks; and by this time they have attained a length of about an eighth of an inch and have become nearly white. Shortly after the maggot is full-grown, its outer skin loosens, be- comes detached from the inner skin, and then turns brown, forming a pro- tective case, which is known as the puparium or "flaxseed," and from which the adult fly will emerge in due 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
