. Circular. Insects. Circular No. 106. Issued May 13, 1909. United States Department of Agriculture, BUREAU OF ENTOMOLOGY, L. O. HOWARD, Entomologist and Chief of Bureau. THE WHEAT STRAWWORM. (Isosoma grande Riley.) By F. M. Webster, In Charge of Cereal and Forage Plant Insect Investigations, Geo. I. Reeves, Assistant in Cereal and Forage Plant Insect The wheat strawworm (fig. 1) sustains about the same relations to winter-wheat culture west of the Mississippi River that the joint worm {Isosoma tritici Fitch)b does to the cultivation of this cereal east of this river. Both, wh
. Circular. Insects. Circular No. 106. Issued May 13, 1909. United States Department of Agriculture, BUREAU OF ENTOMOLOGY, L. O. HOWARD, Entomologist and Chief of Bureau. THE WHEAT STRAWWORM. (Isosoma grande Riley.) By F. M. Webster, In Charge of Cereal and Forage Plant Insect Investigations, Geo. I. Reeves, Assistant in Cereal and Forage Plant Insect The wheat strawworm (fig. 1) sustains about the same relations to winter-wheat culture west of the Mississippi River that the joint worm {Isosoma tritici Fitch)b does to the cultivation of this cereal east of this river. Both, when excessively abundant, occasion losses varying from slight to total. A wheat stem at- tacked by the join two rm may produce grain of a more or less inferior quality and less of it; but the spring attack of the wheat strawworm (fig. 5) is *atal to the plant affected, as no grain at all is pro- duced; and while the second generation of the ame has a less disastrous effect in the field, it - evertheless reduces the grade and weight of the rain. In the Ohio Valley and south of Pennsylvania lie ranges of these two insects overlap (fig. 2); nth species are often to be found in the same eld, the wheat strawworm, however, being less . undant and doing usually but slight injury, diile the jointworm occasionally becomes a seri- os pest. r During the last two years Mr. Reeves has been engaged the investigation of this pest in the State of Washington cooperation with the agricultural experiment station of % t With the exception of the statements made vLtive to the behavior of the pest in the Northwest, for rich exclusive credit is to be given the junior author,' the or author is responsible for the circular. 6 See Circular No. mlture, Fig. 1. Larva of Isosoma grande in wheat straw. (Original.) Bureau of Entomology, United States Department of Agri- 81572—Cir. 106—09. Please note that these images are extracted from scanned page images that may have been digitally enhan
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