Effect of some tomato cultivars on nutritional indices and food utilization of tomato fruit worm, Helicoverpa armigera (Hubner, 1808) (Lepidoptera: Noctuidae)
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Nutritional performance of the larval stages (fourth, fifth, and sixth instars) of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) on unripe green fruit of ten tomato cultivars, including 'Aras', 'Atrak', 'Korall', 'Mobil', 'Rio Grande Hed', 'Sivand', 'Super Chief', 'Super Mobil', 'Super Queen' and 'Super Urbana', was studied at 26±1°C, 60±10% RH and a photoperiod of 16:8 L:D. Approximate digestibility values of the fourth instar larvae were highest (98.24 ± 0.03%) and lowest (95.74 ± 0.06%) on 'Atrak' and 'Super Chief', respectively. Fifth instar larvae fed on 'Mobil' showed the highest relative growth rate (RGR) and relative consumption rate (RCR) (0.32 ± 0.04% and 7.37 ± 0.67%, respectively). Approximate digestibility (AD) values of the sixth instar larvae were highest (96.26±0.114%) and lowest (92.33 ± 0.12%) on 'Super Chief' and 'Super Queen', respectively. The highest ECI and ECD values of total larval instars (4th, 5th and 6th instars) was observed on 'Rio Grande Hed' (4.364 ± 0.093% and 4.593 ± 0.105%, respectively) and the lowest of both values was on ‘Super Urbana’ (3.034 ± 0.021% and 3.187 ± 0.022%, respectively). This research showed that plasticity in food utilization is functionally relevant to tomato cultivars. The results of nutritional indices and the cluster analysis indicated that 'Sivand' and ‘Super Queen’ were unsuitable hosts for feeding of H. armigera.
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