. Circular. Insects. 9 still enable the observer to detect the infestation. Of course later on Jfche infested plants change to yellow and then brown, but the darker -color and rank growth of leaf always precede this. I In summer, in both spring- and fall wheat, the effect of the fly is to. Fig. 10.—Young wheat plant infested by the Hessian fly (original). cause the straw to break over before harvest. It is then said to be 64straw ; IMMUNE OR DISTASTEFUL VARIETIES OF WHEATS. There is no such thing as " fly-proof ; Most wheats will suf- fer when the plants are young,
. Circular. Insects. 9 still enable the observer to detect the infestation. Of course later on Jfche infested plants change to yellow and then brown, but the darker -color and rank growth of leaf always precede this. I In summer, in both spring- and fall wheat, the effect of the fly is to. Fig. 10.—Young wheat plant infested by the Hessian fly (original). cause the straw to break over before harvest. It is then said to be 64straw ; IMMUNE OR DISTASTEFUL VARIETIES OF WHEATS. There is no such thing as " fly-proof ; Most wheats will suf- fer when the plants are young, regardless of variety. In experimen- tal sowings a variety that seems to escape attack one }Tear may suffer. 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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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
