. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE SUGAR-CANE MOTH BORER. 57 as compared with per cent at Audubon Park, where the trash was not burned on any of the fields but one. Comparing this burned- over field with an average of the other stubble fields, we have an infestation of 38 per cent for the burned-over field, while the average infestation of eight unburned stubble fields was per cent, with 36 per cent as the highest infestation on an unburned field. The plantation results in 1917 are in accord with the theory that isolation of fields influen
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE SUGAR-CANE MOTH BORER. 57 as compared with per cent at Audubon Park, where the trash was not burned on any of the fields but one. Comparing this burned- over field with an average of the other stubble fields, we have an infestation of 38 per cent for the burned-over field, while the average infestation of eight unburned stubble fields was per cent, with 36 per cent as the highest infestation on an unburned field. The plantation results in 1917 are in accord with the theory that isolation of fields influences the results of nonburning, using the term " isolation " to mean not only a situation detached from other cane plantings, but one separated from plan- tations where the trash is burned. In a locality in the midst of the sugar parishes, a tj^pical plantation (d e s i g- natecl A on the dia- gram, fig. 12), front- ing on the Mississippi River and running back to swamp land was not burned over, the trash being plowed under in the fall. This plantation was bordered on the north by a burned- over plantation (B), and on the south by a much smaller planta- tion (BB), a long and narrow strip of land which had also been burned over. But bordering these plan- tations was one on the north (0) in which only part of the trash had been burned, the rest having been plowed under, and one on the south (00) treated in the same way. Plantation A, where the trash had not been burned, while bordered on each side by burned-over areas, was yet the center of a district where much of the trash had been saved. The infestation at A was per cent, and at 0 and GO it was per cent and per cent, respectively. At B—burned over, but between A and O and undoubtedly influenced by the trash saved at those places—it was per cent. Plantation BB was over-. Fig. 12.—Diagram of plantations showing percentages of infestation by the sugar-cane moth borer in relation to nonburning of
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