. Report of the State Entomologist of Connecticut for the year .. . n for these beetles was practically terminated,and a clean-up of elm wood in the previously heavily infested towns pre-vented an increase to outbreak proportions the following season. Host plants. This insect attacks all the species of elms within itsrange in this country and is reported to attack practically all the speciesin Europe. It is not reported from any other host than the genus Ulmusin the United States, but in Europe it has been recorded (Escherich, 1923;Nunberg, 1930) from aspen, ash and plum. The Smaller European
. Report of the State Entomologist of Connecticut for the year .. . n for these beetles was practically terminated,and a clean-up of elm wood in the previously heavily infested towns pre-vented an increase to outbreak proportions the following season. Host plants. This insect attacks all the species of elms within itsrange in this country and is reported to attack practically all the speciesin Europe. It is not reported from any other host than the genus Ulmusin the United States, but in Europe it has been recorded (Escherich, 1923;Nunberg, 1930) from aspen, ash and plum. The Smaller European Elm Bark Beetle 295 Life Cycle Chapman (1910) gave the first account of the biology of 5. multistriatusin this country. In 1935 Readio pubUshed a more complete account whichagrees in most details with the observations here reported. C. W. Collins,et al. (1936) made further additions to our knowledge of the biology andhabits of this insect. EMERGENCE of S mu/f/s»nofus ADULTS 1939 =»ST GENERATION 1 SECOND GENERATION 1 1 L LIFE CYCLE ol Sco//ruswtj/ristrOfusUAns». Figure southern Connecticut the first adults emerge during the latter partof May, when the elm leaves are about two-thirds developed. The recordof emergence indicated in Figure 3 was made from infested logs placed inemergence cans from which the beetles were removed daily. These canswere bottomless, placed directly on the soil, covered with two layers of 296 Connecticut Experiment Station Bulletin 434 black cloth, and kept in partial shade. Figure 3 diagrammatically repre-sents the life cycle of S. mullistriatus. In 1939 emergence of the firstgeneration adults began on May 24, was at a peak on June 6, and wascomplete on July 10, a few days before the second generation adultsappeared. Eggs of the first generation are deposited from one to 10 days afterthe adults emerge, and were noted from May 27 to July 15. The peak ofabundance occurred about June 9, shortly after the peak of adult emer-gence. The first generatio
Size: 1284px × 1946px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1901
