See " Effect on young cane-' dead hearts,' " p. 5.) As many as 100 THE SUGAR-CANE MOTH BORER. 6 plants per acre may be destroyed, but so many plants remain in the field that this loss is not great. It should be prevented, however, because it is on these young plants that the borers multiply in sufficient numbers to become a serious menace to larger canes. Under calculable losses the injury to mature cane alone will be considered. The full amount of injury is shown only by chemical analysis. Infested and uninfested cane from Texas, not affected by red rot, a disease which often follows borer damage, was analyzed, with the following results Uninfested.

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In 1918 the Federal Horticultural Board deemed it advisable to establish a research station in a locality where there was a sufficient infestation of the pink bollworm to make possible the gathering of detailed information regarding this serious cotton pest. This research station was established in February, 1918, in Ciudad Lerdo, Durango, Mexico, near Torreon. Approximately 95 per cent of the upland cotton produced in the Republic of Mexico is grown in this vicinity, the so-called Laguna district. 1 Pectinophora gossypiclla Saunders: Order Lepidoptera, family Gelechiidae. 2 This report is based on two years' work in the Laguna, conducted by the Federal Horticultural Board under authority given, in the appropriation for the eradication of the pink bollworm, to investigate in Mexico orelsewiiere the pink bollworm as a basis for control measures. The experts conducting this investigation were transferred to the Board for this purpose from the Bureau of Entomology and this paper is therefore offered for publication as a joint contribution from these two offices. Provision for the establishment of the laboratory in Mexico and authority for the work was obtained through the courtesy of Senor Pastor Rouix, Secretary of Agriculture of Mexico. The work was made possible also by the active cooperation and assistance of the cotton planters of the Laguna. Special thanks are extended to the Tlahualilo Company, the Testamentaria de Carlos Gonzales, and to Mr. Lloyd Rone for the use of their plantations for experimental purposes and many other courtesies. This station was established during 1918 under the general field direction of Mr. August Busck and was continued by the authors of this paper under the general direction of the chairman of the Board and Dr. W. D. Hunter. 11696°-21-Bull. 918 1 It must be kept in mind that the above charts represent the average of the daily readings for each month and not the extremes which BULLETIN 918, U. S. DEPARTMENT OF AGRICULTURE. has to be well prepared and thoroughly cultivated in order to conserve the moisture. The cotton planting begins about February 15 and may continue until June if there are June rains or water in the river. The land is planted as soon as possible after it dries out, as this is necessary to secure germination. Cotton is the principal crop grown in this section, and while there are small areas devoted to corn, wheat, beans, and alfalfa, most of the planters use their land year after year for cotton and buy the feed for their domestic animals elsewhere. No very reliable data are available on acreage and production in the Laguna, but the annual production varies from 60,000 to 150,000 bales, with an average crop of from 75,000 to 80,000 bales. The yield varies from onefourth bale to 2 bales per acre, with an average of from one-half to three-fourths of a bale. All of the cotton is of the short-stapled varieties, as it has been found by experience that these give better results than the long-staple or Egyptian varieties. DISTRIBUTION OF THE PINK BOLLWORM. The species i...

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