تأثیر ارقام کلزا روی پارامترهای جدول زندگی شته خردل Lipaphis erysimi (Hemiptera: Aphididae)

The mustard aphid, Lipaphis erysimi (Kaltenbach) (Hemiptera: Aphididae) is one of the important pests of canola. Effects of four canola (Brassica napus L.) cultivars (Nathalie, Neptune, Danube and Okapi) on life table parameters of L. erysimi were studied at 25±1˚C, 60±5% RH and 16L: 8D hours photoperiods. All cultivars were grown under greenhouse conditions. The development, survival and fecundity of aphids were recorded daily. Data were analyzed using the female age-specific life table. Statistical analysis showed that there were significant differences in duration of nymphal developmental time and fecundity of aphid on different canola cultivars. The nymphal developmental time of L. erysimi on Okapi (8.91±0.15 day) were longer than those on other cultivars. The shortest nymphal developmental time was observed on Nathalie (7.13±0.07 day). According to the results, the rm value of L. erysimi ranged between 0.30 on Nathalie and 0.21 day-1 on Okapi. The highest values of rm (0.30±0.00 day-1), R0 (30.62±1.35 offspring), finite rate of increase (1.35±0.01 day-1) and the lowest mean generation time (11.54±0.12 days) and DT (2.34±0.03 days) were recorded on Nathalie. Shorter nymphal developmental time, longer adult longevity as well as greater intrinsic rate of increase, net reproductive rates, finite rate of increase, fecundity and survivorship revealed that this pest performed well on Nathalie, Neptune and Danube cultivars. Consequently, the results indicated that canola cultivars had significant effect on life table parameters of L. erysimi and the Nathalie, Neptune and Danube cultivars were the suitable hosts for population growth of the pest. In addition, using the less susceptible cultivars could be effective in decreasing pest control costs.