. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 8. Syrphus americanus, whose larva destroys the oat aphis, a, Female fly; b, second abdominal segment'of male. Enlarged. (From Webster and Phillips.) DESTRUCTION OF BREEDING PLACES. As has been observed by the writer and other assistants of the Cereal and Forage-Crop Insect Investigations, the plant-louse under discussion thrives best in rank-growing wheat, for instance in spots where manure piles or straw stacks have stood, as well as in the vicinity of straw stacks where the growth of grain is usually luxu- rian
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 8. Syrphus americanus, whose larva destroys the oat aphis, a, Female fly; b, second abdominal segment'of male. Enlarged. (From Webster and Phillips.) DESTRUCTION OF BREEDING PLACES. As has been observed by the writer and other assistants of the Cereal and Forage-Crop Insect Investigations, the plant-louse under discussion thrives best in rank-growing wheat, for instance in spots where manure piles or straw stacks have stood, as well as in the vicinity of straw stacks where the growth of grain is usually luxu- riant. In fact, observations show that the lat- ter place is the usual center of infestation, for during the colder winter months the plant-lice may be found here when it is impossible to locate them elsewhere. Such locations also provide much better protection from inclement weather, and reproduction may continue, more or less, throughout the winter. Therefore it is evident that if the growth about straw. Fig. 9.—The convergent ladybird {Hippodamia convergens), an enemy of the oat aphis: a, Beetle; b, pupa; c, larva. Enlarged. (From Chittenden.). 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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