. Circular. Insects. liipsrtjf si ih Unllsd Slates Government, Circular No. 66, Revised Edition. issued September 21,1908. tfWYERMTY of ttiJMOB. United States Department of Agriculture, r BUREAU OF ENTOMOLOGY, L. O. HOWARD, Entomologist and Chief of Bureau. THE JOINT-WORM. (Isosoma tritici Fitch.) By F. M. Webster, In Charge of Cereal and Forage Plant Insect Investigations. Since the first known serious outbreak of the joint-worm (Isosoma Iritici Fitch), which occurred in the wheat fields about Charlottesville and Gordonsville, Va., during the years 1848 to 1854, this insect has beenreported a
. Circular. Insects. liipsrtjf si ih Unllsd Slates Government, Circular No. 66, Revised Edition. issued September 21,1908. tfWYERMTY of ttiJMOB. United States Department of Agriculture, r BUREAU OF ENTOMOLOGY, L. O. HOWARD, Entomologist and Chief of Bureau. THE JOINT-WORM. (Isosoma tritici Fitch.) By F. M. Webster, In Charge of Cereal and Forage Plant Insect Investigations. Since the first known serious outbreak of the joint-worm (Isosoma Iritici Fitch), which occurred in the wheat fields about Charlottesville and Gordonsville, Va., during the years 1848 to 1854, this insect has beenreported at irregular intervals and from widely separated localities. |W hile it is known to occur sparingly over most of the wheat-growing sections of both the United States and Canada, and probably does i) >re damage than has generally been attributed to it, its reappear- nce in the wheat fields of Indiana, Michigan, Ohio, Pennsylvania,. Fig. 1.—Isosoma tritici: Adult of the joint-worm. Much enlarged (from Howard). West Virginia, Virginia, Maryland, and Kansas in 1904, and in still g 3ater numbers in 1905, serves to bring it again to notice. In 1904 nae fields of wheat in eastern Ohio were so badly damaged that they • ;re not harvested, and in 1905 a serious outbreak in northeastern 1. diana so discouraged some farmers that they questioned the advisa- bility of putting in a crop of wheat at all. In southwestern Virginia the pest was even more injurious in 1905 than it was the previous year. The pest was also very destructive in western Ohio and eastern Indiana during the spring of 1908. 52718—Cir. 66—08. 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 United States. Bureau of Entomology. Washington, Govt. print. off.
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