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نویسندگان

چکیده

شته پنبه و جالیز، Aphis gossypii و شته شاخک بلند پنبه، Acyrthosiphon gossypii Mordv.
(Hom.: Aphididae) جزو آفات مهم پنبه می‌باشند. با توجه به اهمیت شته شاخک بلند پنبه در خراسان، این بررسی جهت تعیین سطح زیان اقتصادی آن در طی سال‌های 79 – 1378 در ایستگاه تحقیقات کشاورزی کاشمر در قالب طرح بلوک‌های کامل تصادفی انجام شد و چهار تیمار 5، 10 و 15 شته در برگ و شاهد بدون آلودگی (با سمپاشی) در 3 تکرار در روی بوته‌های زیر قفس با آلودگی مصنوعی مورد بررسی قرار گرفتند. در تیمار شاهد جهت سمپاشی از سم کونفیدور به میزان 250 سی‌سی در هکتار استفاده شد. نمونه‌برداری هر10 روز یک بار از 5 بوته از هر کرت انجام و شته‌های 3 برگ بالایی هر بوته شمارش گردید. هنگام برداشت محصول، وزن یک غوزه، درصد غوزه‌های باز هر بوته، عملکرد وش و طول الیاف تعیین شد. داده‌های جمع‌آوری شده با نرم‌افزارهای SAS و JMP تجزیه و تحلیل شد و با استفاده از شیب خط رگرسیون سطح زیان اقتصادی شته شاخک بلند پنبه تعیین گردید. بر اساس معادلات رگرسیونی دو سال آزمایش، یک رابطه خطی منفی بین عملکرد وش با تعداد شته وجود داشت و آستانه اقتصادی این شته 3/6 تا 9/6 حشره در سه برگ بالایی هر بوته بدست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of Economic Injury Level of Large cotton aphid Acyrthosiphon gossypii in Kashmar

نویسندگان [English]

  • M. Sirjani
  • A. Rezvani

چکیده [English]

Cotton aphid, Aphis gossypii, and large cotton aphid, Acyrthosiphon gossypii
(Hom.: Aphididae) are the most important aphids of cotton fields in Iran. The large cotton aphid is more important in Khorasan, therefore this research was conducted in Kashmar region for determination of Economic Injury Level of this aphid during 1999-2000. The complete randomized block design with 3 replication was used and treatments included 0, 5, 10 and 15 aphid per leaf under cages measuring 2×2×1 m. For control of the aphids in check treatment, plants were sprayed with Confidor (250cc/h). Sampling has been done from three upper leaves of 5 plants in each plot with 10 days interval. At the end of this study, datas concerning boll weight, %boll opening, yield and fiber length was analyzed with SAS and JMP. Economic injury level of this aphid was calculated using regression equations and Norton formula. Results indicated that EIL for large cotton aphid, Acyrthosiphon gossypii in Kashmar was 6.3-6.9 aphid per 3 upper leaf of stem.
 
 

کلیدواژه‌ها [English]

  • Cotton
  • Acyrthosiphon gossypii
  • Economic injury level
  • Kashmar
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