. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 13 Under much the .same conditions I have reared the greatest nmiibers of joint-worm flies, at present known as Isowma tritlcl Fitch, from the Virginia r^^e grass {Elymus virginlcus^ fig. 2). In this case the grass from which I secured these insects in greatest profusion came from the most neglected roadsides. In the vicinity of the cit}' of Urbana, 111., I secured material from two localities, one quite near the resident quarter, where the city government required the mowing off of weeds and grasses, conuuencing
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 13 Under much the .same conditions I have reared the greatest nmiibers of joint-worm flies, at present known as Isowma tritlcl Fitch, from the Virginia r^^e grass {Elymus virginlcus^ fig. 2). In this case the grass from which I secured these insects in greatest profusion came from the most neglected roadsides. In the vicinity of the cit}' of Urbana, 111., I secured material from two localities, one quite near the resident quarter, where the city government required the mowing off of weeds and grasses, conuuencing in June, and the other farther from town, along a neglected bank where the grass was allowed to grow up un- distur])ed year after year. From grass stems from the former local- it}^ I secured almost nothing, while from that coming from the latter locality 1 obtained enough to show that there was here a constant menace to the wheat fields in the neighborhood. Now, as a matter of fact, there is comparatively little wheat or rye grown in the neighborhood, and until I reared these insects from the wild grasses I could not account for their sud- den appearance in the wheat and r3^e fields, observed and recorded in former years by Professor Forbes and his assistants. What has proven true here has been shown to follow similar conditions elsewhere in both Illinois and Indiana. That is to say, where farmers have allowed these grasses to grow up al>out their farms year after jq'ay under the impression that they were not worth an}'^ attention, I have found the insects in abundance, and also find that despite their otherwise good farming, they have probably suffered more or less from the attacks of the two species of destructive Isosoma in their grain, though they may not have observed them or their subtile effects on the kernels of the wheat and rye. I am convinced that there is an element of loss here of which farmers are unaware and the precise effects of which they do not therefore
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