No abstract

THE CANADIAN ENTO>lOLOGIS~ 49 and the tacks replaced. The cage is loaded with moths through the watering port (0). The cage is rotated by supporting it on two revolving parallel steel shafts (X) covered with rubber hose (Y) (Figs. 1, 2, 9). The rubber hose prevents the cage from slipping during rotation. The steel shafts are rotated at a speed that will result in about four complete revolutions of the cage per hour. Increasirlg the numbers of revolutions per hour reduces the numbers of eggs laid per female because the moths are disturbed too nlucll bv the faster moving oviposition paper. Under our methods of operation (moths exposed to natural sunlight at 2622°C and about 70% R.H., and the watering wick remoistened daily) total egg recovery over a 7-day period was approximately 90 eggs per female when the cage was loaded with 900 male and 900 female moths. However, the optimum numbers of moths per cage have not been established. Cages smaller than the one described here yielded more eggs per female, but the slightly increased yield did not justify the extra work involved in handling the larger numbers of cages. The cage described here could easily be adapted for many other insect species.Reference . 1966. Oviposition cage for the tobacco budworm and the corn earworm. 1. econ. Ent. 59: 1290. AbstractCan. Ent. 102: 49-53 (1970) Wood and bark extracts from balsam fir, red cedar, spruce, hemlocli, and pine were assayed for juvenile hormone-mimicking activity on pupae of the wax moth. All the extracts showed noticeable activity; the woad extracts were generally more active than the bark extracts. The results suggest that the purification of the extracts from these conifers might lead to, the isolation of compounds with high hormone-mimicking potential.