. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. iN\'i:sri(iA rioN (H' ' II is'i()i;\- 43 molted twice in the jais. The moilalily I'oi- th(^ season of 1909 was 10 per cent of tlie <S,2<S0 laivje which were fed in this way, and for 1910 it readied 12 per cent of the 8,720 larvic tliat hatched. It is interestint; to compare these fi:ures A^th tliose for the year 190S wlien a smaller number of larvne was fed individually in jelly «j;lasses provided with cheesedotli covers. A considerable nund)er of lai-vae escaped by fo)cin<2; their way throuf2;h the
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. iN\'i:sri(iA rioN (H' ' II is'i()i;\- 43 molted twice in the jais. The moilalily I'oi- th(^ season of 1909 was 10 per cent of tlie <S,2<S0 laivje which were fed in this way, and for 1910 it readied 12 per cent of the 8,720 larvic tliat hatched. It is interestint; to compare these fi:ures A^th tliose for the year 190S wlien a smaller number of larvne was fed individually in jelly «j;lasses provided with cheesedotli covers. A considerable nund)er of lai-vae escaped by fo)cin<2; their way throuf2;h the covers and in all 13,8 per cent of the total for tlie year (2,854) were either lost or died. This shows that the imi)roved covers used on jars the followinji^ years and tlie experience (gained in handlin<^ the larva' have resulted in reducing the moitality. Since the work began, July 23, 1907, nearly 20,000 Calosoma larva? have been cared for and most of these have been liberated in the field. In August, 1909, a considerable stock of Calosoma larvae was on hand at the laboratory, and as it seemed advisable to feed and carry them through the larval stages and liibernation w here they could be under direct observation they were placed in large box cages (see PI. V) set in the ground. These were 2 by 3^ feet in size, and were provided with a fine wire- netting bottom so that the larva3 could not escape. The earth in the cages was 15 inches deep. Several cylinders of galvanized iron wire, 17 inches in diameter, were also constructed for the same purpose and were sunk in the ground and later stocked with larvje and food. (See fig. 18.) These cylindeis were lined on the inside with mosquito netting and the tops and bottoms were made of the same mateiial. One thousand three hundred and eight second and third stage Calosoma larvjB were placed in these cages or cylinders between July 30 and August 27, 1909, and of this number 210 larvae, or per cent, were killed ])y their comra
Size: 1856px × 1346px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
