Field assessment of antibiosis of different winter rapeseed varieties to Brevicoryne brassicae L.
Subject Areas :
Keywords: Resistance, Brassica napus, Brevicoryne brassicae, rm value,
Abstract :
Waxy cabbage aphid (Brevicoryne brassicae) is one of the most importan pests of rapeseed. It causes serious yield losses by sucking host plant sap. In this study, antibiosis of rapeseed cultivars (namely Opera, SLM 046, Okapi, Zarfam, Licord and Modena) was studied against waxy cabbage aphid. This study was carried out as a randomized complete block design in the field condition. The estimated variables were the survival percent of nymphal stage, its developmental time, fecundity, intrinsic rate of population increase (rm), and also the lifespan of apterous adults. The ANOVA of these data indicated that there is no significant difference among the varieties, yielded that their antibiosis is similar against the pest. Therefore, it seems that this character might not intervene in variety selection. According to this research, mean survival percentage of nymphal stage, developmental time, number of offspring, rm values and adult longevity were 89.57 ± 2.34 %, 14.09 ± 0.28 days, 47.13 ±1.07 nymphs, 0.206 ± 0.005 and17.26 ± 0.38 days, respectively.