Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 20 1 2018 01 01 Genotype-Associated Variation in Nutritional Indices of Helicoverpa armigera (Lepidoptera: Noctuidae) Fed on Canola 83 94 16128 EN Y. Fathipour Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran. E. Chegeni Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran. S. Moharramipour Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran. Journal Article In this study, the nutritional indices of the larval stages of <em>Helicoverpa armigera</em> (Hübner) were determined on 10 canola (<em>Brassica napus</em> L.) genotypes (Talaye, Opera, Licord, Modena, SLM₀₄₆, Hayula₄₂₀, Zarfam, Okapi, RGS₀₀₃ and Sarigol) at 25±1˚C, 60±5% RH and a photoperiod of 16: 8 (L: D) hours. The third instar larvae reared on Talaye showed the highest value of Efficiency of Conversion of Ingested food <em>ECI</em> and Efficiency of Conversion of Digested food <em>ECD</em> (7.005±0.632 and 8.972±1.862, respectively). However, the lowest value of <em>ECI</em> and <em>ECD</em> was on Licord (0.503±0.017 and 2.507±0.449, respectively). The highest (0.778±0.091) and lowest (0.594±0.059) Relative Growth Rate (RGR) of the fourth instar larvae were obtained on SLM₀₄₆ and Sarigol, respectively. Results indicated that the highest values of <em>ECI</em> and <em>ECD</em> for fourth instar larvae were on Talaye (6.300±0.585 and 8.880±1.954, respectively). The lowest value of the Relative Consumption Rate (RCR) and Approximate Digestibility (AD) of the fifth instar was recorded on Modena (5.193±0.629 and 38.625±11.340, respectively). The <em>ECI</em> and <em>ECD</em> values of the fifth larval instar were the highest on Talaye (9.893±0.889 and 19.655±0.966, respectively). The highest value of <em>RCR</em> and <em>AD</em> of the sixth instar was on Okapi (7.781±0.665 and 82.223±1.922, respectively). Among different genotypes tested, the highest <em>ECI</em> and <em>ECD</em> of the whole larval instars (12.323±0.310 and 32.357±5.508, respectively) were observed on Talaye and the lowest ones (5.947±0.257 and 6.922±0.320, respectively) were on Okapi. Together, Talaye and Okapi were the most suitable and unsuitable genotypes, respectively, for <em>H. armigera</em> larvae<em>.</em> https://jast.modares.ac.ir/article_16128_8a5058234fc3c1cdbb0e54c3fbdaeb33.pdf