Bulletin Volume 73-74 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...1906--Continued. D. FALLEN SQUARES. From Table XVI A, hanging, dried bolls, it appears that threefourths of the number examined contained no weevil stage. In this case there were found 1.227 weevil stages for each boll which was found to contain any. The percentage containing some stage shows an exceedingly wide variation between the 1.3 per cent for San Antonio, where the infestation was slight, and the 83 per cent at Waco on September 20, where the infestation was very heavy. It seems that the presence or absence of a weevil stage has little, if anything, to do with the retention by the plant of a portion of its surplus fruit, but that the abundance of weevils in proportion to their food supply may be largely responsible for the variations which appear in the percentage of these, dried, hanging bolls which contain some weevil stage. In Table XVI B, among the hanging dried squares, nearly 59 per cent of these examined contained some weevil stage. In this case there were found an average of but 1.01 stages per square. The percentage containing weevil stages varies somewhat, as it did in the case of dried bolls, but the variations are not exactly parallel. One reason for this apparent lack of agreement may be found in the fact that weevils show considerable preference for squares, and therefore attack them to a much larger extent than they do the small bolls. Among the bolls an average of 24.6 per cent contained some stage of the weevil, while among the dried squares there were 58.8 per cent. In Table XVI C, fallen bolls, it appears that an average of only about 18 per cent contained some weevil stage. In this case there were found 1.106 weevil stages for each boll found to contain any. Examinations in three localities failed to reveal any weevil stage in a ...