Entomology Bulletin - New Series Volume 114-115
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...combine to make it one of the most difficult insects to control. It is, consequently, natural that all the investigations of the Bureau of Entomology have pointed toward the prime importance of methods of control which involve no outlay for materials and very little for labor. Methods which involve some direct financial outlay for material or machinery are not in accord with labor conditions surrounding cotton production in the United States. Moreover, the indirect methods advocated are in keeping with the general tendency of cotton culture that is, to procure an early crop, and at the same time have the great advantage of avoiding damage by a large number of other destructive insects, especially the bollworm. Nevertheless it must not be understood that attention has not been paid to the investigation of means looking toward the direct extermination of the pest. Much work has been done, but the results have all been negative. BASIS FOR MEANS OF REPRESSION. In spite of the many difficulties involved in the control of the boll weevil certain generally satisfactory means of repression are at hand. They consist of both direct and indirect means. Those of an indirect nature are designed to increase the advantage gained by the direct measures and to increase the effectiveness of the several natural factors which serve to reduce the nuiruber of weevils. Thus, the control measures constitute a combination of expedients, the parts of which interact in many ways. Naturally, the best results are obtained when the planter can put into practice all of the essential parts of the combination. 1 This section is greatly modified from Bull. 51, Bureau of Entomology, pp. 160,161. It is obvious that any method of controlling the boll weevil must depend upon...
- 189 x 246 x 7mm | 240g
- 13 Sep 2013
- United States
- black & white illustrations