. Bulletin of the Department of Agriculture. Agriculture; Agriculture. MEXICAN" BEAN" BEETLE IN THE SOUTHEAST. 13 In the Southeast the beetles begin to leave their winter quarters in the spring as early as late March and early April, or at about the time when early garden beans are coming up. At Birmingham, Ala., this date was March 22 in 1921, and April 6 in 1922. At Chattanooga, Tenn., it was early in May in 1922. At Thomasville, Ga., the first beetles emerged in the field March 27, 1922. One individual of a colony of beetles, marked black, November 18, 1921 (Group 2, Table 6)
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. MEXICAN" BEAN" BEETLE IN THE SOUTHEAST. 13 In the Southeast the beetles begin to leave their winter quarters in the spring as early as late March and early April, or at about the time when early garden beans are coming up. At Birmingham, Ala., this date was March 22 in 1921, and April 6 in 1922. At Chattanooga, Tenn., it was early in May in 1922. At Thomasville, Ga., the first beetles emerged in the field March 27, 1922. One individual of a colony of beetles, marked black, November 18, 1921 (Group 2, Table 6), was collected in a bean field April 22, 1922, three-fourths of a mile from the place where it had spent the winter. The beetle is thus able L/FE CYCLE. OI/ERW/A/TERED BEETLES F/RST GENERAT/OA/ LARl/AE. F/RST GENERAT/ON BEETLES SECOA/D GENERAT/ON LARYAZ SECOND GENERAT/ON BEErLES TR/RD GENERAT/ON LARU^E TR/RD GENERAT/ON BEETLE'S FOL/RTR GENERAT/ON LARVAE FO//RTN GENERAT/OA/ BEETLE'S BEETLES /A/ R/BERNAT/OA/ ACT/'SE PER/ODâBEETLES â â ACTIVE PER/ODâLARl/A^ EARLY RECORDS OF/92/ Fig. 8.âSeasonal life history of the Mexican bean beetle: Composite chart prepared from insectary records and field observations during 1921 and 1922 near Birmingham, Ala. (eggs and pupae not shown). Width of bands shows relative abundance of beetles and larva? in the field. The insect is most abundant in July. to make extensive flights at this time of the year. In New Mexico, J. E. Graf found beetles hibernating 1\ miles from the nearest bean field, and still farther from the most likely source. The spring migration lasts until early June, covering a period of about two months. The beetle flies considerably all during the summer from field to field and travels great distances. During August, 1921, and late July, 1922, the beetles became restless and were often on the wing. During this period beetles a week or more old fed less than earlier in the season. It is believed that the greatest distribution
Size: 1155px × 2162px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
