تاثیر آفت کش های فوزالون، پیریدالیل، فن پیروکسی میت روی فراسنجه های زیستی زنبور Bracon hebetor

نوع مقاله : مقاله پژوهشی

نویسنده

گروه گیاه‌پزشکی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

10.22034/aej.2022.321869.2718

چکیده

زنبور Bracon hebetor Say (Hymenoptera: Braconidae) یکی از مهم ترین پارازیتوئید‌‌های خارجی مرحله‌ی لاروی بسیاری از آفات بال‌پولک‌دار به ویژه شب‌پره‌های خانواده Pyralidae و Noctuidae است. این زنبور در سطح وسیع در برنامه‌‌های کنترل بیولوژیک به کار می‌رود. همه ساله در مزارع پنبه آفت کش‌هایی مصرف می‌شود که می‌تواند بر روی دشمنان طبیعی از جمله زنبور B. hebetor اثر کشنده داشته باشد. در این تحقیق اثرات کشندگی و زیرکشندگی آفت‌کش‌های متداول مصرف در زراعت پنبه از جمله فوزالون، پیریدالیل و فن‌پیروکسی‌میت روی زنبور B. hebetor در شرایط آزمایشگاهی با دمای1±26 درجه سلسیوس، رطوبت نسبی 5±60 درصد و دوره‌ نوری 16 ساعت روشنایی و 8 ساعت تاریکی مورد ارزیابی قرارگرفت. آزمایش‌های زیست‌سنجی روی مراحل نابالغ همراه با میزبان به روش غوطه‌وری انجام گرفت. تاثیر غلظت توصیه شده‌ مزرعه‌ای آفت‌کش‌ها بر روی مراحل لاروی و شفیرگی زنبور B. hebetor بررسی گردیده و طبق گروه‌بندی سازمان بین‌المللی کنترل بیولوژیک (IOBC) هر چهار آفت‌کش در گروه آفت‌کش‌های کم ضرر قرار گرفتند. در بررسی اثرات زیرکشندگی آفت‌کش‌ها (LC25) بر روی حشرات کامل ماده زنبور معلوم گردید که همه‌ فراسنجه‌های زیستی، تولید‌مثلی و جمعیت پایدار تحت تاثیر آفت‌کش‌ها قرار دارند. مقادیر rm و R0 برای شاهد و آفت‌کش‌های فوزالون، پیریدالیل و فن‌پیروکسی‌میت به ترتیب 0/23، 0/21، 0/18 و 0/23 ماده بر ماده بر روز و 1/17±69/36˓ 0/71±33/78˓ 0/46±26/35 و 2/43±40/76 ماده بر ماده بر نسل به دست آمد ترتیب سمیت حشره‌کش‌‌های مورد استفاده بر روی زنبور پارازیتوئید به صورت فوزالون > پیریدالیل > فن‌پیروکسی‌میت بود. مقایسسه میانکین داده‌ها بر اساس آزمون توکی(p<0/05) نشان داد که اختلاف بین آن ها معنی‌دار است. اثرات منفی آفت‌کش ها روی افراد بالاتر سطوح غذایی از جمله پارازیتوئیدها به خوبی شناخته نشده است، اما بر اساس یافته‌های این تحقیق، فن‌پیروکسی‌میت یک آفت کش مناسب برای تلفیق در سیستم‌های مدیریت آفات زراعی و کشاورزی می‌باشد که فاقد اثرات سوء قابل اندازه گیری روی دشمنان طبیعی کلیدی و مهم مانند زنبور براکون می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effects of Phosalone, Pyridalil and Fenpyroximate on Bracon hebetor life history parameters

نویسنده [English]

  • Manizheh Jamshidi
Department of Plant Protection, Tabriz Branch, Islamic Azad University, Tabriz, Iran
چکیده [English]

Bracon hebetor Say (Hymenoptera: Braconidae), is one of the important ectoparasitoid on larval stage of many lepidopterous pests especially Noctuidae and Pyralidae. These wasps are used widely in biological control programs. Every year a variety of pesticides are used in cotton fields, which affects natural enemies such as B. hebetor. In this research, lethal and sub-lethal effects of commonly used pesticides in cotton fields such as Phosalone, Pyridalil and Fenpyroximate, on B. hebetor were evaluated under laboratory conditions (25±1ºC, 60±5 r.h. and a photoperiod of 16L: 8D h). In this research, lethal and sub-lethal effects of commonly used pesticides in cotton fields such as Phosalone, Pyridalil, and Fenpyroximate, on B. hebetor were evaluated under laboratory conditions (25±1ºC, 60±5 r.h. and a photoperiod of 16L: 8D h). In the next stage of study, bioassay experiments by application of dipping were carried out on immature B. hebetor. The effects of field recommended concentrations of the pesticides were assessed on the larval and pupal stages of B. hebetor according to IOBC standard methods‚ thus the results showed that every of three pesticides were classified as slightly harmful. Assessment of pesticides sub lethal effects on adult warps which were exposed to LC25 revealed, stable population parameters, biological and reproductive parameters were influenced by this pesticide. The mean value of Net reproductive rate (R0) and intrinsic rate of increase (rm) for phosalone, pyridalil and fenpyroximate, were calculated 33.78±0.71, 26.35± 0.45 and 40.76±2.43 female/female/generation and 0.21, 0.18 and 0.23 female/female/day, respectively. Comparison of means using Tukey's test (p<0.05) shows that, different between the means is significant. Also negative effects of pesticides on parasitoids unknow well but our results showed that the order of toxicities of the insecticides on B. hebetor was as follows: phosalone > pyridalil > fenpyroximate and fenpyroximate is suitable pesticide for interment pest managements.

کلیدواژه‌ها [English]

  • Bracon hebetor
  • Integrated pest management
  • Intrinsic rate of increase
  • Parasitoid
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