Genetically manipulated Brassica genotypes affect demography and performance of Diadegma semiclausum parasitizing Plutella xylostella

• Published in: Journal of applied entomology (1986) Vol. 141; no. 3; pp. 161 - 171
• Main Authors: Nikooei, M., Fathipour, Y., Javaran, M. Jalali, Soufbaf, M.
• Format: Journal Article
• Language: English
• Published: Berlin Wiley Subscription Services, Inc 01.04.2017
• Subjects: Brassica rapa; Diadegma; Diadegma semiclausum; Hymenoptera; Ichneumonidae; Lepidoptera; manipulated Brassica; Plutella xylostella; Plutellidae; two‐sex life table
• ISSN: 0931-2048; 1439-0418
• DOI: 10.1111/jen.12316

The performance of Diadegma semiclausum (Hellen) (Hymenoptera: Ichneumonidae) on Plutella xylostella (L.) (Lepidoptera: Plutellidae) reared on canola's progenitor (Brassica rapa L.), two cultivated canola cultivars (Opera and RGS003), one hybrid (Hyula401), one gamma‐ray mutant‐RGS003 and one transgenic (PF) genotype was compared using the age‐stage, two‐sex life table parameters. All experiments were carried out in a growth chamber at 25 ± 1°C, 65 ± 5% RH and a photoperiod of 16 : 8 (L : D) h. There were significant differences in duration of different life stages of D. semiclausum on its host larvae reared on different plant genotypes. The shortest (12.27 days) and longest (15.21 days) pre‐adult developmental times were observed on cultivar‐RGS003 and hybrid‐Hyula401, respectively. The intrinsic rate of increase (r) in D. semiclausum ranged between 0.189/day (cultivar‐Opera) and 0.141/day (transgenic‐PF). Moreover, the highest (20.078 offspring) and lowest (12.027 offspring) net reproductive rates (R0) were observed on cultivar‐Opera and hybrid‐Hyula401. The mean generation time (T) of D. semiclausum was the highest (18.34 days) and lowest (15.05 days) on mutant‐RGS003 and cultivar‐RGS003. The maximum and minimum parasitism values of this parasitoid were observed on canola's progenitor (44.28%) and hybrid‐Hyula401 (37.09%). The heaviest pupae (3.82 mg) and females (3.22 mg) of the parasitoid were found on canola's progenitor and cultivar‐Opera, respectively. The results showed that performance of this parasitoid was better on canola's progenitor and cultivated plants known to have higher levels of glucosinolates concentration than others.