Effects of two juvenile hormone analogs on biological parameters of striped bug Graphosoma lineatum (L.) (Hem.: Scutelleridae)
Subject Areas :
Keywords: Biological parameters, Pyriproxyfen, Graphosoma lineatum (L.), Methoprene,
Abstract :
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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