Population growth parameters of Brevicoryne brassicae (Hem.: Aphididae) on different canola cultivars

Brevicoryne brassicae (L.) is one of the important pests of canola in Iran and some countries of the world. Population growth parameters of this aphid were evaluated by two-sex life table method on different canola cultivars (Opera, SLM046, RGS000, Okapi, Delgan, Licord, H19, and Modena) at 25 ± 1 °C, 65 ± 5% RH and a 16:8 h (L:D) photoperiod. Net reproductive rate (R0) varied from 7.48±1.11 to 26.95±4.24 offsprings per generation on eight canola cultivars; the lowest value was on H19 and Okapi and the highest value was on Modena, Opera, SLM046, Delgan and Licord. The lowest intrinsic rate of increase (rm) was related to aphids that were fed on cultivars Okapi and RGS000 (0.176±0.001 and 0.209±0.002 day-1). However, rm value was the highest when aphids were fed on cultivars Modena, Opera, Delgan, and SLM046. The results of this study indicated that Okapi and RGS000 were relatively resistant, and Modena, Opera, Delgan, and SLM046 were susceptible cultivars to B. brassicae.