Über latente Wirkungen einiger Insektenwachstumsregeler auf das Körpergewicht von Arbeiterinnen der HonigbieneApis mellifera L. var.Carnica (Hym., Apidae)

Abstract

Three insect growth regulators were applied topically on the 3-day old larvae of carniolan honeybee workers in their own cells. The high and intermediate lethal doses (LD₉₀ and LD₅₀) from each of three tested IGR's (Triflumuron, Chlorfluazuron and Diflubenzuron) had a “Removal-lethal” effect on treated larvae. Thus, neither sealed brood nor adult workers were obtained from IGR's — treated-larvae. While latent inhibitory action of the lower lethal dose (LD₂₅) of all tested IGR's showing a remarkable significant decrease in body weights of newly emerged workers, resulting from IGR's-treated-larvae.

The differences between the effect of tested IGR's on the workers weights were significant. The tested IGR's could be arranged in descending order according to their reducing effect on workers weights as follows: Triflumuron, Chlorfluozuron and Diflubenzuron.

Zusammenfassung

Die Applikation der drei Insektenwachstumshemmstoffe (IGRs) Triflumuron, Chlorfluazuron und Diflubenzuron bei 3 Tage alten Larven dercarnica-Rasse der Honigbiene hatte in den LD 50- und LD 90-Dosen eine „Entfernungsletalwirkung”: die Ammenbienen entfernten die behandelten Larven, so daß aus diesen keine Arbeitsbienen entstanden, deren Gewicht hätte bestimmt werden können. Dagegen entwickelten sich die mit den LD 25-Dosen der 3 IGRs behandelten Larven zu Arbeiterinnen, deren Gewicht gegenüber Kontrolle i. M. um 39,6% (Triflumuron), — 29,1% (Chlorfluazuron) sowie 19,3% (Diflubenzuron) vermindert war.