The larger corn stalk-borer . UCTION. In many southern cornfields a heavy wind late in the season, be-fore the corn is matured, does great damage by breaking the plantsoff at the surface ofthusAnexamination of thesebroken stems will, inmost cases, show thatthey have beengreatly weakened bythe burrows of alarva or larva (fig. 1) isknown as the lar-ger corn stalk-borer (Diatrcea sacchara-lis). Its work islargely within thestem of the plant andis so concealed that,in most cases, unless weather conditions make it conspicuous, thepresence of the insect passes unnoticed. °This is pr
The larger corn stalk-borer . UCTION. In many southern cornfields a heavy wind late in the season, be-fore the corn is matured, does great damage by breaking the plantsoff at the surface ofthusAnexamination of thesebroken stems will, inmost cases, show thatthey have beengreatly weakened bythe burrows of alarva or larva (fig. 1) isknown as the lar-ger corn stalk-borer (Diatrcea sacchara-lis). Its work islargely within thestem of the plant andis so concealed that,in most cases, unless weather conditions make it conspicuous, thepresence of the insect passes unnoticed. °This is practically a revision of Circular No. 16, prepared many yearsago by Dr. L. O. Howard. Mr. Ainslie was formerly in the employ of thisBureau as an agent and expert in cereal and forage insect investigations, andthis pest was one of the subjects of investigation assigned to him. He after-wards did some work upon the species for the South Carolina AgriculturalExperiment Station in cooperation with this —No. 116—10. Fig. 1.—The larger corn stalk-borer (Diatrcea saccharalis) :a, Summer form of larva; ~b, c, hibernating forms oflarvse; d, third thoracic segment from above; e, eighthabdominal segment from above; /, abdominal segmentfrom above ; g, same from side, a, 5, c, Enlarged; c7, e, f,still more enlarged. (Redrawn from Howard.) This insect seems to have been originally an enemy of sugar caneand to have first transferred its attention to corn in the southernpart of this country, where corn and cane are grown over the sameterritory. It occurs in many countries where sugar cane is the staplecrop, and has caused great damage in the AYest Indies, British Guiana,Australia, and Java. The bulk of the evidence goes to show that itwas first brought into this country with the importation of sugar-cane cuttings from the West Indies and Central and South America,where, since early times, it has interfered with the production of thisstaple. In the United States this borer is
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