. Bulletin of the U.S. Department of Agriculture. Agriculture. 86 BULLETIN 429, U. S. DEPARTMENT OF AflRTCULTTTTtE. In order that observations might be made during the peritxl of cocooniiig and at the time of pupation without disturbing the speci- jiuMis in tlioir normal manner of procedure, small strips of wood with shght partitions between them were used, held together by paper cHps bent at a convenient angle. Over the partitions was ])asted a thin film of mica with a sprinkling of fine sawdust under- neatli. This device, described in previous publications of the bureau, proved to suffice th

- Image ID: RGBHC0
. Bulletin of the U.S. Department of Agriculture. Agriculture. 86 BULLETIN 429, U. S. DEPARTMENT OF AflRTCULTTTTtE. In order that observations might be made during the peritxl of cocooniiig and at the time of pupation without disturbing the speci- jiuMis in tlioir normal manner of procedure, small strips of wood with shght partitions between them were used, held together by paper cHps bent at a convenient angle. Over the partitions was ])asted a thin film of mica with a sprinkling of fine sawdust under- neatli. This device, described in previous publications of the bureau, proved to suffice th
Book Worm / Alamy Stock Photo
Image ID: RGBHC0
. Bulletin of the U.S. Department of Agriculture. Agriculture. 86 BULLETIN 429, U. S. DEPARTMENT OF AflRTCULTTTTtE. In order that observations might be made during the peritxl of cocooniiig and at the time of pupation without disturbing the speci- jiuMis in tlioir normal manner of procedure, small strips of wood with shght partitions between them were used, held together by paper cHps bent at a convenient angle. Over the partitions was ])asted a thin film of mica with a sprinkling of fine sawdust under- neatli. This device, described in previous publications of the bureau, proved to suffice throughout the period of experimentation. Figure 7 is an illustration of the strips of wood used.. Fig. 7.—DcNice used to obtain pupal records of the codling moth. (Hammar.) THE SPRING BROOD. SPRING BROOD OP PUP.K. T'inie of pufation.—The first record of pupation of ovei-wintering larvae took place March 23, and from that date pupation continued more or less regularly for a period of 51 days, the last pupation recorded occurring on May 13. Length of pupal stage.—The length of the pupal period of the spring brood has a range of from 12 to 36 days, the majority of the indi- viduals, however, completing the stage after 26 days had elapsed. The average for the entire time is found to be 22.97 days. (See Table XXXII.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.

Similar stock images