تأثیر دو آنالوگ هورمون جوانی روی برخی ویژگی‌های زیستی سن نواری چتریان Graphosoma lineatum (L.) (Hem.: Scutelleridae)
محورهای موضوعی : حشره شناسی گیاهان زراعی
کلید واژه: (L.) Graphosoma lineatum, متوپرن, پایری‌پروکسی‌فن, ویژگی‌های زیستی,
چکیده مقاله :
سن Graphosoma lineatum (L.) یکی از آفات گیاهان تیره ی چتریان می‌باشد. از این سن، همچنین در پرورش انبوه زنبورهای پارازیتویید تخم سن‌گندم به عنوان میزبان واسط استفاده می شود. در این تحقیق اثر متوپرن و پایری پروکسی فن روی برخی ویژگی های زیستی مراحل مختلف رشدی سن نواری چتریان مورد بررسی قرار گرفت. در این تحقیق هر کدام از حشره کش ها در سه غلظت 200، 500 و 1000 پی پی ام به دو روش تماسی و گوارشی مورد مطالعه قرار گرفتند. صفات مورد بررسی در این تحقیق شامل: طول دوره ی سنین پورگی، درصد افراد بدشکل، تعداد تخم گذاشته شده، طول دوره ی جنینی و درصد تفریخ تخم ها بود. در این بررسی مشخص شد که روش تماسی بیشتر از روش گوارشی طول دوره ی رشدی پوره ها را افزایش داد. همچنین مشخص شد که افراد بد شکل تحت تأثیر حشره کش متوپرن به طور معنی داری بیشتر مشاهده شد و تعداد تخم کمتری در مقایسه با پایری پروکسی فن گذاشته شد. افزایش غلظت ها تأثیر معنی داری بر تعداد تخم گذاشته شده نداشت. طول دوره ی جنینی تحت تأثیر غلظت های مختلف متوپرن افزایش معنی داری در مقایسه با پایری پروکسی فن و شاهد نشان داد.
Graphosoma lineatum (L.) is a pest of Umbelliferous plants. The eggs of this insect are used in mass rearing of sunn pest egg parasitoids. In this study the effects of methoprene and pyriproxyfen on some biological parameters of different developmental stages of Graphosoma lineatum were evaluated. Three concentrations including 200, 500 and 1000 ppm of two juvenile hormone analogs (methoprene and pyriproxyfen) by two bioassay methods (contact and ingestion) were studied. The studied properties were including, effects on developmental periods, number of malformed individuals, and also effects on eggs number laid per female, the embryogenesis and finally the percent of egg hatching. The results showed that the contact method of assay was more effective than ingestion in developing time of nymphs. Methoprene was more effective than pyriproxyfen in malformed individual formation and also in reducing the number of laid eggs. Increasing the concentration of the insecticides had nonsignificant effect on the number of laid eggs. Methoprene affected the embryogenesis more than pyriproxyfen. The rate of hatching was significantly reduced by the insecticides in comparison with control.
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