بررسی رشد و نمو وابسته به دما در زنبور Telenomus busseolae، انگل‌وارۀ تخم Sesamia cretica

نوع مقاله : علمی پژوهشی-فارسی

نویسنده

دانشیار گروه حشره‌شناسی و بیماری‌های گیاهی، پردیس ابوریحان، دانشگاه تهران، ایران

چکیده

ساقه‌خواران نیشکر Sesamia cretica Lederer و S. nonagrioides Lefevere از مهم‌ترین آفات مزارع نیشکر در ایران محسوب می‌شوند. مهم‌ترین دشمن طبیعی این آفات در خوزستان، زنبور انگل‌وارۀ تخم Telenomus busseolae Gahan می‌باشد که نقش قابل توجهی را در تنظیم جمعیت آفت ایفاء می‌نماید. دما مهم‌ترین عامل محیطی است که رشد و نمو حشرات را تحت تأثیر قرار می‌دهد. به منظور بررسی ارتباط تغییرات دما و روند رشد و نمو زنبور T. busseolae تأثیر 7 دمای ثابت 15، 18، 20، 25، 30، 35 و 37 درجۀ سلسیوس بر طول دوره رشدی مراحل نابالغ زنبور هنگام فعالیت روی تخم S. cretica مورد مطالعه قرار گرفت .جهت توصیف اثر دما روی سرعت رشد و نمو مراحل نابالغ زنبور و تعیین آستانۀ دمایی از دو مدل خطی معمولی و ایکموتو و تاکای استفاده شد. نتایج حاصل از تجزیه رگرسیون بین دما و طول دوره نابالغ زنبور روی تخم میزبان نشان داد که دما به‌طور معنی‌داری در هر دو جنس نر و ماده بر طول دورۀ رشدی قبل از بلوغ زنبور تأثیر دارد. اگرچه هر دو مدل خطی قادر به توصیف داده بودند ولی مدل ایکموتو و تاکای برازش بهتری را روی داده‌ها ارائه نمود. با استفاده از مدل خطی ایکموتو و تاکای، آستانۀ دمایی در دو جنس نر و ماده زنبور روی تخمS. cretica به ترتیب 44/12 و 50/12 درجۀ سلسیوس و نیاز گرمایی 250 و 255 روز- درجه تعیین شد.

کلیدواژه‌ها

عنوان مقاله [English]

Temperature-dependent development of parasitoid wasp, Telenomus busseolae on Sesamia cretica

نویسنده [English]

  • A. Jamshidnia
Associate Professor, Department of Entomology and Plant Pathology, College of Aburaihan, University of Tehran, Iran
چکیده [English]

Background and Objectives
The sugarcane stem borers, Sesamia cretica Lederer and S. nonagrioides Lefever are the most important pests of sugarcane in Iran causing heavy losses in cane and considerable reduction in sugar yield. The egg parasitoid wasp, Telenomus busseolae Gahan is the most remarkable natural enemy of Sesamia spp. in Khuzestan province, Iran that plays an important role in regulating the populations of sugarcane stem borers. Temperature is an effective abiotic factor that influences the development of natural enemies. The present study aimed to investigate the temperature-dependent development of T. busseolae on S. cretica.
Material and Methods
The development rates and thermal constant of the immature stages of T. busseolae on S. cretica eggs were studied at seven constant temperatures (15, 18, 20, 25, 30, 35, and 37ºC), a photoperiod of 16L:8L, and 65%±5% RH. Fresh egg masses of S. cretica were exposed to the newly mated female of T. busseolae for 6 h. Afterwards, the parasitized eggs were kept at different temperatures. The parasitized eggs were checked daily until adult emergence. Development rate was modeled as a function of temperature using two mathematical models, including common and Ikemoto and Takai linear models. The linear models were analyzed using the SAS software.
Results
The results of regression analysis showed that the immature developmental period of T. busseolae decreased with elevating temperature from 18ºC to 35ºC. In 15ºC and 37ºC, no development rate was found for T. busseolae. Immature development time declined from 45 to 11 days and 46 to 12 days in male and female parasitoids, respectively. The percent of adult emergence was not affected by temperature. However, two linear models provided a satisfactory relationship between immature development rate and temperature. Based on statistical criteria, Ikemoto and Takai linear model estimated thermal constant and temperature threshold more precisely. For male and female parasitoids, the thermal constant was 250 and 255 degree-days and the low-temperature threshold was 12.44ºC and 12.5ºC on S. cretica eggs, respectively.
Conclusion
In the current study, the thermal requirement of T. busseolae on S, cretica was estimated for the first one. Information regarding the thermal requirement of T. busseolae can be useful for the rearing and application of this parasitoid in the biological control of sugarcane stem borers. This finding could be used to predict the number of T. busseolae generations and the best time for parasitoid release in sugarcane fields.

کلیدواژه‌ها [English]

  • linear model
  • thermal requirement
  • temperature threshold

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گیاه پزشکی
دوره 44، شماره 2
تیر 1400
صفحه 97-105

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