دینامیسم جمعیت پروانه ابریشم باف ناجورLymantria dispar (Lepidoptera : Lymantriidae) دریاسوج
محورهای موضوعی : گیاه پزشکی
کریم سعیدی
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کلید واژه: دینامیسم جمعیت, پروانه ابریشم باف ناجور, یاسوج, Population Dynamics, Gypsy moth, Yasouj,
چکیده مقاله :
طی سالهای 1385 و 1386، مطالعاتی به منظور بررسی تغییرات جمعیت پروانه ابریشم باف ناجور Lymantria dispar L. و میزان وابستگی تراکم آفت در سالهای مذکور نسبت به یکدیگر به منظور تهیه مدلهای جمعیتی آن در منطقه یاسوج انجام گردید. در این مطالعه، با بررسی نمونه های موجود در ده باغ پراکنده در نقاط مختلف منطقه یاسوج، تراکم دسته های تخم زمستان گذران تعیین گردید. میانگین تعداد دسته های تخم زمستان گذران در کل منطقه یاسوج برای سال های 1385 و 1386 در 50 متر مربع 2/0 ± 71/1 و 3/0 ± 88/2 و در یک هکتار به ترتیب 22 ± 342 و 37 ± 576 دسته تخم برآورد گردید. برای سال های مطالعه، منحنی تغییرات تراکم دسته های تخم زمستان گذران رسم شد. نتایج این منحنی ها، نشان دهنده فعالیت آفت با تراکم پایین جمعیت (کمتر از 600 دسته تخم در هکتار) در منطقه یاسوج می باشد. تجزیه رگرسیونی داده های به دست آمده نشان داد که فقط 37/32 درصد واریانس انبوهی دسته های تخم آفت در سال 1386 تحت تاثیر انبوهی آن در سال قبل یعنی 1385 قرار داشته و بیش از 68 درصد واریانس انبوهی تحت تاثیر عوامل ناشناخته دیگری (از قبیل، نوع غذا یا کیفیت غذایی گیاهان میزبان، عوامل آب و هوایی، پارازیتوئیدها، پرداتورها، عوامل بیماریزا و غیره) قرار دارد.
A research was conducted in Yasouj region to determine population dynamics of the gypsy moth in 2006 and 2007. Also it was aimed to calculate the correlation coefficient between the population densities of 2006 and 2007, in order to build a predictive model for the pest. The number of overwintering egg masses was counted during the winter months in ten different orchards. The number of egg masses of the pest was recorded at weekly intervals in ten orchards during the growth seasons in 2006 and 2007. Results indicated that the egg mass densities were 1.71 ± 0.2 and 2.88 ± 0.3 per fifty squares meter and 342 ± 22 and 576 ± 37 egg masses per hectare in winters 2006 and 2007, respectively. Regression analysis of the pest population density in 2006 and 2007 indicated that only 32.37% of the 2007 population variance could be accounted for the population density in 2006. It was obvious that more than 68% of the population changes are under the influence of unknown biotic and abiotic environmental factors.
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