Are insecticidal seed treatments effective on overwintered adults of Sunn pest, Eurygaster integriceps(Hemiptera: Scutelleridae)?

Document Type : Paper, English

Authors

Agricultural Entomology Research Department, Iranian Research Institute of Plant Protection, Tehran, Iran

Abstract

Application of insecticides against overwintered adults of Sunn pest has limitations. To find the new measurement against the insect, two insecticides imidacloprid, and thiamethoxam, were tested as seed treatments against overwintered adults of Sunn pest in semi-field and field conditions in Alborz province. This project was carried out in a split-plot design with planting dates at 3 levels (at the beginning of wheat cultivation in 2016, Nov. 7, mid- and late-dates in 2016, Nov. 20, and Dec. 4) as the main plots and seed treatments at 5 levels, including imidacloprid 700WS with two concentrations of 1 and 0.5 g/kg of wheat seed and thiamethoxam 350FS with two concentrations of 0.8 and 0.4 g/kg and control (without seed treatment) as the sub-plots. The comparison of the mean efficiency of treatments at different cultivation dates in the semi-field conditions showed that the lowest (9.1%) and the highest (71.66%) efficiencies were observed at the beginning and late cultivation dates, respectively. In seed treatments, thiamethoxam at high concentration had the maximum efficacy (84.4%) 48 days after the last planting date, and the minimum efficacy (5.55%) was related to thiamethoxam at low concentration 116 days after. The results of field conditions showed that the highest (15%) and lowest (1.25%) efficacies of seed treatments were 97 days after the last cultivation date. Thiamethoxam seed treatment at high concentration had the highest efficiency (21.6%) among the treatments at the first sampling date. On other sampling dates, the efficiency of all treatments was less than 10%. The seed treatment with imidacloprid and thiamethoxam did not have acceptable effectiveness against overwintered adults and nymphs of Sunn pest. Also, the change in the cultivation date of seed-treated wheat cannot be effective in reducing the overwintered adult population of Sunn pest.

Graphical Abstract

Are insecticidal seed treatments effective on overwintered adults of Sunn pest, Eurygaster integriceps(Hemiptera: Scutelleridae)?

Keywords

Main Subjects

Article Title [Persian]

آیا روش بذر مال با حشره کش روی سن بالغ زمستان گذران Eurygaster integriceps (Hemiptera: Scutelleridae)موثر است؟

Authors [Persian]

  • عزیز شیخی گرجان
  • علی محمدی‌پور
بخش حشره شناسی کشاورزی، موسسه تحقیقات گیاه‌پزشکی کشور، تهران، ایران
Abstract [Persian]

کنترل شیمیایی علیه سن مادر به روش محلول پاشی با محدودیت­هایی همراه است. استفاده از روش ضدعفونی بذر گندم با غلظت مناسب در مناطقی که احتمال ریزش سن مادر در آن مزارع بیشتر است می­تواند کارایی کنترل شیمیایی علیه سن مادر را بهبود بخشد. به همین خاطر برای تعیین میزان کارایی کنترل شیمیایی سن گندم به روش ضدعفونی بذر از دو حشره‌کش ایمیداکلوپراید (گائوچو) و تیامتوکسام (کرویزر) به روش ضدعفونی بذر علیه سن بالغ زمستان‌گذران (سن مادر) استفاده شد. آزمایش در استان البرز در شرایط مزرعه و گلخانه اجرا گردید. این پروژه به صورت اسپلیت پلات در قالب طرح بلوک‌های کامل تصادفی اجرا شد که فاکتور اصلی، تاریخ کشت در سه سطح ( همزمان با شروع کشت گندم تاریخ 16/08/1395، اواسط تاریخ کشت گندم 29/08/1395، اواخر تاریخ کشت گندم 13/09/1395 ) و فاکتور فرعی آن تیمارهای ضدعفونی بذر در 5 سطح شامل ضدعفونی بذر با حشره‌کش گائوچو 700WS با دو غلظت 1و 5/0 گرم بر کیلو‌گرم بذر گندم و حشره‌کش کرویزر350FS با دو غلظت 8/0و 4/0 گرم بر کیلو گرم بذر گندم و شاهد (بدون ضدعفونی بذر گندم) بود. مقایسه میانگین درصد کارایی تیمارها در تاریخ‌های کشت مختلف در گلدان نشان داد که کمترین و بیشترین درصد کارایی تیمارها به ترتیب مربوط به تاریخ کشت اول (1/9%) و آخر (66/71%) است و در حشره‌کش تیامتوکسام با غلظت بالا ، بیشترین کارایی (4/84%) در 48 روز و کمترین کارایی (5/5%) در غلظت پایین آن حشره‌کش در 116 روز بعد ازآخرین تاریخ کاشت حاصل شد. بررسی داده‌ها در شرایط مزرعه نشان داد که بیشترین (16/15%) و کمترین (25/1%) درصد کارایی تیمارهای ضدعفونی بذر در 97 روز بعد ازآخرین تاریخ کشت بود. همچنین مقایسه تیمارهای ضدعفونی بذر از نظر درصد کارایی نشان داد که تیمار تیامتوکسام در غلظت بالا و در اولین نوبت نمونه‌برداری بیشترین کارایی را در میان تیمارها داشت (6/21%) و در بقیه تاریخ‌های نمونه برداری درصد کارایی همه تیمارها کمتر از 10 درصد بود. در مجموع، ضدعفونی گندم با حشره‌کش‌های ایمیداکلوپراید و تیامتوکسام روی سن مادر و پوره کارایی قابل قبولی نداشت.

Keywords [Persian]

  • ایمیداکلوپراید
  • تیامتوکسام
  • حشره کش
  • کنترل شیمیایی
  • مدیریت آفت

© 2024 by Author(s), Published by the Entomological Society of Iran

This Work is Licensed under Creative Commons Attribution-Non Commercial 4.0 International Public License

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Journal of Entomological Society of Iran
Volume 44, Issue 2
March 2024
Pages 181-187

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