. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PKOGHKSS HKI'oKT ()N T1IK KCHoPEAM COBM BOREB 29 INJURY TO THE EAR It is evident that the injury to the stalk may indirectly affect the ear by interfering with the supply of nutriment, such injury depend- ing, of course, not only upon the stage of development of the ear during the maximum period of injury, but also upon the degree of injury to the stalk. The ear may be entered directly by the borers (fig. 11) at any stage of their development, at its tip, base, or side; or it may be entered indirectly through the short
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PKOGHKSS HKI'oKT ()N T1IK KCHoPEAM COBM BOREB 29 INJURY TO THE EAR It is evident that the injury to the stalk may indirectly affect the ear by interfering with the supply of nutriment, such injury depend- ing, of course, not only upon the stage of development of the ear during the maximum period of injury, but also upon the degree of injury to the stalk. The ear may be entered directly by the borers (fig. 11) at any stage of their development, at its tip, base, or side; or it may be entered indirectly through the short stem by. Fig. 10.—" Close-up" of hill of sweet corn ruined by Eu- ropean corn borer. Stalks sectioned to show extensive damage within. There were an average of :'.T Unci's im- plant in this field. Medford. September, 1922 which the ear is attached to the stalk. Ordinarily the ear is entered at its tip (fig. 9) by small borers which feed first upon the silk, or the tender portion of the husk, subsequently working their way down into the cob and grain. Ears entered in this manner do not always exhibit external evidences of infestation, as the small particles of frass made by the larvae in entering sometimes are very incon- spicuous and the external evidences of feeding are small. It fre- quently is necessary to strip away the husk before evidence of. 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. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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