Comprative life table parameters of the Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) on corn hybrids under laboratory conditions


1 گروه گیاه پزشکی، دانشکده‌ی علوم کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران.

2 گروه تنوع زیستی، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران.


کرم برگخوار چغندر Spodoptera exigua، آفت پلی­فاژی است که به محصولات زیادی در جهان خسارت وارد می­کند. در این تحقیق پارامترهای رشد جمعیت این آفت بر روی چهار هیبرید تجاری ذرت شامل Keynes540، Keynes410، KSC260 و KSC400 در شرایط کنترل شده­ی آزمایشگاهی (دمای 1 ± 25 درجه سلسیوس، رطوبت نسبی 5 ± 65 درصد و در دوره­ی نوری 16 ساعت روشنایی و 8 ساعت تاریکی) مورد بررسی قرار گرفت. براساس نتایج نشان داد که نرخ بقای (lx) افراد در زمان ورود افراد هم‌ سن اولیه به مرحله­ی حشره کامل (درصد ظهور بالغین) روی هیبریدهای KSC260، Keynes410، Keynes540 و KSC400 به­ترتیب 77/0، 70/0، 62/0 و 58/0 بوده است. بیش­ترین میزان باروری ویژه­ی سنی (mx) شب­پره­های پرورش یافته روی هیبریدهای Keynes540، Keynes410، KSC260 و KSC400 به­ترتیب 75/28، 70/21، 37/20 و 33/16 ماده/ماده/روز به­ترتیب مربوط به روزهای 39، 40، 41 و 45 بود. ماده­های پرورش یافته روی هیبرید KSC400 کم­ترین و روی هیبرید KSC260 بیش­ترین نرخ خالص تولیدمثل (R0) را داشتند. مقدار نرخ ذاتی افزایش جمعیت (rm) از 102/0 (بر روز) تا 137/0 (بر روز) متغیر بود که کم­ترین مقدار آن نسبت به سایر هیبریدها روی هیبرید  KSC400مشاهده شد. طولانی­ترین (83/0 ± 37/35 روز) میانگین مدت زمان یک نسل (T) روی هیبرید KSC400 و کوتاه­ترین مقدار آن (93/0 ± 67/30 روز) روی هیبرید Keynes410 بود. هم­چنین کم­ترین و بیش­ترین مقدار نرخ متناهی افزایش جمعیت (λ) به­ترتیب روی هیبریدهای KSC400 و  Keynes540به­دست آمد. نتایج حاصل از این پژوهش نشان داد که هیبرید KSC400 در مقایسه با سایر هیبرید­های مورد آزمایش، هیبرید نامناسبی برای تغذیه لاروهای کرم برگخوار چغندرقندمی­باشد.


عنوان مقاله [English]

Comprative life table parameters of the Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) on corn hybrids under laboratory conditions

نویسندگان [English]

  • M. Mardani-Talaee 1
  • G. Nouri-Ganbalani 1
  • B. Naseri 1
  • M. Hassanpour 1
  • L. Mottaghinia 1
  • S. M. Mansouri 2
1 Department of Plant Protection, Faculty of Agricultural Science, University of Mohaghegh Ardabili, Ardabil, Iran.
2 Department of Biodiversity, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
چکیده [English]

The effects of four corn hybrids, Keynes540, Keynes410, KSC260 and KSC400, were investigated on life table parameters of the beet armyworm in a growth chamber that was set at 25 ± 1 ºC, 65 ± 5% RH and 16:8 (L: D) photoperiod. The highest survivorship (lx) of adults were 0.77, 0.70, 0.62 and 0.58 on KSC260, Keynes410, Keynes540 and KSC400, respectively. The highest age-specific fecundity (mx) of females which were emerged from the larvae being fed on above-mentioned hybrids were recorded 28.75, 21.70, 20.37 and 16.33 female/ female/ day, that occurred at the days 39, 40, 41 and 45, respectively. The females reared on KSC400 showed the lowest net reproductive rate (R0), while the highest R0 was recorded on KSC260 hybrids. The intrinsic rate of natural increase (rm) ranged from 0.1028 to 0.1370 day-1 of which the lowest was on KSC400. The lowest and highest values of finite rate of increase (λ)were obtained on KSC400 and Keynes540, respectively. The longest mean generation time (T)(35.37 ± 0.83 days) was observed on KSC400 and the shortest one (30.67 ± 0.93 days) was on Keynes410. The results showed that KSC400 was the least suitable host for S. exigua.

کلیدواژه‌ها [English]

  • Spodoptera exigua
  • rm
  • Survival rate
  • corn hybrids
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