Identifier: mexicancottonbol114hunt (find matches)
Title: Mexican cotton-boll weevil : Message from the President of the United States, transmitting a communication from the Secretary of Agriculture submitting a report on the Mexican cotton-boll weevil
Year: 1912 (1910s)
Authors: Hunter, W. D. (Walter David), 1875-1925 Pierce, W. Dwight (William Dwight), 1881-1967
Subjects: Boll weevil
Publisher: Washington, D.C. : (Govt. print. off.)
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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s has been known to be cov-ered in this manner. If, on the other hand, the first flight carriesthe weevil into an uninfested field it remains there. Consequently,the advance is slowest in regions where cotton fields are numerous.The occurrence of the leaf wTorm, Alabama argillacea, in great numbersin any locality destroys the food and tends to cause decidedly longerflights of the dispersing weevils. So far as we have been able to discover, the weevil has no sense bywhich it can locate cotton. Such a sense may exist, but the generalaimless flight of thousands upon thousands of individuals seemssufficient to account for the infestation of all fields in new territory.An interesting observation wTas made by the junior author and Mr.G. N. Wolcott near Meridian, Miss., that the early dispersingweevils, in flying through hill country with heavy woods, foundonly the patches on the tops of the hills and from these graduallyspread downward to the denser cotton. Till: MEXICAN COTTON-BOLL WEEVIL.
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NATURAL DISSEMINATION. 89 The fall movement of the weevil has been studied carefully eachyear since 1904. (See fig. 21.) The circumstances have been differ-ent each season, but with uniformity within certain limits. Severalexamples will be given. In the fall dispersal of 1904 the weevilsseemed to have crossed the line of continuous infestation in southernLouisiana about August I, and a little later toward the north, butin all cases the movement had crossed the line by the 20th of August.In this year there were two very well-defined dispersals with abouta month intervening. This might indicate that the first dispersalwas caused by the lack of food and that in another month a newgeneration found itself confronted by the same conditions as itspredecessor and was also forced to disperse. In 1906 the movement seems to have been more irregular, for thefirst serious new infestation was in central Louisiana rather thanin the southern part of the State. In the light of present knowledgethis wa

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