تراکم جمعیت و توزیع فضایی مراحل نابالغ سوسک چهار نقطه ای حبوبات (Callosobruchus maculatus (Col.: Bruchidae روی لوبیا چشم بلبلی در منطقه تهران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 مرکز آموزش عالی شهید باکری میاندوآب، دانشگاه ارومیه، ارومیه، ایران

2 گروه حشره‌شناسی کشاورزی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران

چکیده

تراکم جمعیت، برنامه نمونه ­برداری و الگوی توزیع فضایی تخم و لارو سوسک چهارنقطه ­ای حبوبات Callosobruchus maculatus  روی لوبیا چشم بلبلی رقم پرستو در منطقه تهران مورد مطالعه قرار گرفت. غلاف لوبیا به عنوان واحد نمونه ­برداری انتخاب و اندازه مناسب نمونه با حداکثر خطای 20%، معادل 50 واحد نمونه­ برداری تعیین شد. برای تعیین الگوی توزیع فضایی تخم و لارو حشره مورد مطالعه از روش رگرسیونی تیلور و آیوائو، شاخص پراکندگی و شاخص میانگین ازدحام لوید استفاده شد. رابطه بین طول و قطر غلاف با تعداد تخم نیز به روش رگرسیون خطی تعیین شد. بین تعداد تخم و طول غلاف، رابطه معنی ­داری وجود داشت که از نوع مثبت بود و نشان ­دهنده این است که هر چه طول غلاف بیشتر باشد، تعداد تخم گذاشته شده روی آن نیز بیشتر خواهد بود. بین تعداد تخم و قطر غلاف نیز رابطه معنی­دار و از نوع مثبت بود ولی بین تعداد لارو و طول غلاف و همچنین بین تعداد لارو و قطر غلاف، رابطه معنی­داری مشاهده نشد. همچنین الگوی توزیع فضایی مراحل نابالغ آفت با استفاده از روش رگرسیونی تیلور، شاخص پراکندگی و شاخص میانگین ازدحام لوید، تجمعی به دست آمد. ورود این آفت از اوایل تابستان شروع شده و نوسان­ های نامنظم در جمعیت آن طی تاریخ ­های مطالعه نمونه ­برداری مشاهده شد.

کلیدواژه‌ها


عنوان مقاله [English]

Population density and spatial distribution of immature stages of Callosobruchus maculatus (Col.: Bruchidae) on cowpea in Tehran region

نویسندگان [English]

  • R. Taghizadeh 1
  • Y. Fathipour 2
1 Shahid Bakeri High Education Center of Miandoab, Urmia University, Urmia, Iran
2 Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran.
چکیده [English]

       Population density, sampling program and spatial distribution pattern of the eggs and larvae of Callosobruchus maculatus on cowpea (var. Parastoo) were determined in Tehran region. Bean pod was selected as a sample unit and the reliable sample size with maximum relative variation of 20% was obtained 50. Taylor's power law and Iwao's patchiness regression, Index of dispersion and Lloyd's mean crowding methods were used for determining the spatial distribution pattern of eggs and larvae of the pest. The relationship between length and diameter of pods with number of laid eggs was determined using linear regression. There was significant positive relationship between number of eggs and the length of pods. The relationship between number of eggs and diameter of pods was also significantly positive. There was no significant relationship between number of larvae and length/diameter of bean pods. Moreover, the spatial distribution pattern of immature stages of pest using Taylor's method, index of dispersion and Lloyd's mean crowding was aggregated. Occurrence of the pest in field was observed early summer and irregular population fluctuation was recorded during growing season. 

کلیدواژه‌ها [English]

  • Callosobruchus maculatus
  • Sampling
  • Spatial distribution
  • Population density
  • Cowpea
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