systemic effects of juvenoids on the red firebug Pyrrhocoris apterus and on the pea aphid Acyrthosiphon pisum with data on life table response

• Published in: Pest management science 2007-10, Vol.63 (10), p.1026-1035
• Main Authors: Jedlička, Pavel, Hrdý, Ivan, Kuldová, Jelena, Wimmer, Zdeněk
• Format: Article
• Language: English
• Subjects: Acyrthosiphon pisum; Animals; Aphids - drug effects; Biological and medical sciences; Chemical compounds; chemical structure; Comparative analysis; Control; fecundity; Female; Fundamental and applied biological sciences. Psychology; Heteroptera - drug effects; ingestion; insect pests; insect reproduction; Insects; juvenile hormone analogs; Juvenile Hormones - analysis; Juvenile Hormones - pharmacology; juvenogen; juvenogens; juvenoids; life table; longevity; Longevity - drug effects; Organic chemistry; Peas; Phytopathology. Animal pests. Plant and forest protection; Protozoa. Invertebrates; Pyrrhocoris apterus; Reproduction - drug effects; synthesis; systemic effect; topical application
• ISSN: 1526-498X; 1526-4998
• DOI: 10.1002/ps.1435

BACKGROUND: A series of juvenoid alcohols and their glycosidic derivatives (juvenogens), synthesized at the Institute of Organic Chemistry and Biochemistry in Prague, commercially used juvenoids and the natural derivatives of juvabione were evaluated for their systemic juvenilizing effect on the red firebug, Pyrrhocoris apterus L., and on the pea aphid, Acyrthosiphon pisum Harris. A life table response experiment was designed, and demographic characteristics were computed for a cohort of A. pisum following chronic exposure to a range of concentrations of the selected trans-isomer of carbamate juvenoid 8 applied via the broad bean (Vicia faba L.) root system.RESULTS: Using the ratio of topical and per os activities, promising effects were found in two alkyl β-D-glucopyranosides (3 and 9) and the trans-isomer of carbamate juvenoid 8 in tests on P. apterus. In A. pisum, the highest systemic activity was found in tests with the trans-isomer of carbamate juvenoid 8. The longevity, the number of offspring per female and the number of offspring per reproducing female significantly decreased with concentrations of 0.05 mg mL⁻¹ and higher. While the net reproductive rate R₀ and the intrinsic rate of natural increase rm displayed similar trends, the generation time G varied slightly between 11.6 and 12.8 days.CONCLUSION: Expected systemic activity of glycosidic juvenogens in P. apterus was not confirmed by exposure of the pea aphid on broad bean treated with aqueous solutions of the compounds. Nevertheless, the carbamate juvenoid alcohol 8 displayed a considerable juvenilizing effect on A. pisum in screening tests. Furthermore, this compound indicated a sublethal effect as the realized fecundity Ux decreased disproportionately to the age-specific survival Lx with increased concentration. The population parameters are compared with the data in similar demographic studies and are discussed together with the possibilities of using the compounds of this structural type in practice. Copyright © 2007 Society of Chemical Industry