با همکاری انجمن‏‌ بیماری شناسی گیاهی ایران

نوع مقاله : حشره شناسی کشاورزی

نویسندگان

1 مؤسسة تحقیقات گیاه‌پزشکی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

2 مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، ایستگاه تحقیقات کشاورزی و منابع طبیعی بروجرد، سازمان تحقیقات، آموزش و ترویج کشاورزی، بروجرد، ایران

چکیده

سن بذرخوار Nysius cymoides به‌طور عمده در مزارع کلزای مناطق مختلف کشور و نزدیک رسیدن دانه‌ها، در جمعیت‌های انبوه ظاهر می‌شود. برای تهیة مدل نمونه‌برداری دنباله‌ای این سن، آماربرداری از جمعیت تخم، سنین مختلف پورگی و حشرات کامل در مزرعة کلزا واقع در ایستگاه تحقیقات کشاورزی بروجرد طی دو سال انجام شد. با استفاده از یک کادر فلزی 5 × 5 سانتی‌متری و لولة مکش هفته‌ای دو بار به‌طور تصادفی نمونه‌ها جمع‌آوری، درون الکل به آزمایشگاه منتقل و به تفکیک مراحل یاد شده شمارش شد. از پارامترهای روش تیلور برای تهیة مدل نمونه‌برداری دنباله‌ای به روش Green (1970) با سطوح دقت 10، 15 و 25 درصد استفاده شد. نتایج نشان داد که در همة مدل‌ها بدون درنظر داشتن سطح دقت، اندازة نمونة لازم برای مرحلة زیستی تخم بیشتر از سایر مراحل بود. برآورد اندازة نمونه با افزایش تراکم جمعیت مراحل مختلف زیستی سن بذرخوار به‌میزان قابل ملاحظه‌ای کاهش یافت. به‌طور کلی، برای ردیابی جمعیت سن N. cymoides، مدل نمونه‌برداری دنباله‌ای با سطح دقت 25 درصد توصیه می‌شود زیرا اندازة نمونه را نسبت به مدل با سطح دقت 15 درصد به بیش از نصف کاهش می‌دهد. همچنین مدل‌های با سطح دقت 10 درصد به‌دلیل برآورد اندازة نمونة بزرگ در عمل قابل استفاده نبودند.

کلیدواژه‌ها

عنوان مقاله [English]

Sequential sampling of the canola false chinch bug, Nysius cymoides (Hem.: Lygaeidae)

نویسندگان [English]

  • J. MOHAGHEGH-NEYSHBOURI 1
  • M. AMIRMAAFI 1
  • SH. SHAHROKHI KHANGHAH 1
  • A. PIRHADI 2

چکیده [English]

Crowds of the false chinch bugs Nysius cymoides appear in many canola fields of the country at pod ripening stage. To develop sequential sampling plans for eggs, immature stages and adults of the bug, samples were taken during two years from a canola field in the Broojerd Agricultural Research Station. Samples were randomly collected twice a week using a 5 × 5 cm quadrat and an aspirator. Then, the specimens were carried to the lab in alcohol tubes for counting the different stages. Taylor’s power law parameters were used to create Green’s sequential sampling plans at 10, 15 and 25 percent precision levels. The results showed that sample size for eggs was larger than nymphs and adults for different levels of precision. Sample sizes were dramatically reduced by increasing population density in different sequential models. Generally, sequential sampling models at 25 percent precision level are recommended for monitoring N. cymides populations due to reducing sample sizes to less than half, compared with those at 15 percent precision level. However, the 10 percent precision level models were not applicable because of large sample size estimations.

کلیدواژه‌ها [English]

  • Sequential sampling
  • Sample size
  • Taylor's power law
  • Nysius cymoides
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