Respiratory metabolic responsiveness during the pupal stage of the red palm weevil, Rhynchophorus ferrugineus (Coleoptera: Curculionidae) to certain plant extracts.
The prepupae of Rhynchophorus ferrugineous were topically applied with one of three dose-levels (0.1, 0.005 or 0.001 microgram/insect) of Jojoba oil (Joj) or azadirachtin (Azt). The daily O2 consumption and CO2 respiratory output were determined and the respiratory quotient (RQ) was calculated. After Joj treatments, O2 consumption of early- and late pupae increased as the dose-level was decreased. The respiration curve did not assume an U-shaped pattern as common in the pupal stage of many insect species. Also, an inhibitory action of Azt on the pupal respiration has been clearly exhibited. A similar result of the respiration curve was observed by Azt. All dose levels of Joj, but only the higher two ones of Azt, suppressed the CO2 release. Both botanicals inhibited the RQ during the pupal stage. However, all RQ mean values of treated or control pupae were < 1.0 and > 0.7.
Bream
A S
AS
Faculty of Science, Al-Azhar University, Madinet Nasr, Cairo, Egypt.
Ghoneim
K S
KS
Tanani
M A
MA
Nassar
M I
MI
D000818:Animals; D002245:Carbon Dioxide / Q000378:metabolism; D001517:Coleoptera / Q000378:metabolism* / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D007306:Insecticides / Q000494:pharmacology*; D036701:Limonins / Q000737:chemistry / Q000494:pharmacology; D010101:Oxygen Consumption; D010936:Plant Extracts / Q000494:pharmacology*; D011679:Pupa; D012119:Respiration / Q000187:drug effects*; D014885:Waxes / Q000737:chemistry / Q000494:pharmacology
D007306:Insecticides; D036701:Limonins; D010936:Plant Extracts; D014885:Waxes; D002245:Carbon Dioxide; C034743:jojoba wax; C010329:azadirachtin